Main shaft bearing thermal expansion test tool
By designing a spindle bearing thermal expansion test fixture, the thermal expansion of the bearing is simulated by utilizing the extensibility of the expansion block, which solves the problem of inconvenient testing in the existing technology and improves the reliability and stability of the bearing.
Patent Information
- Application Number
- CN202520674241.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-04-10
AI Technical Summary
The lack of existing fixtures for testing the thermal expansion of spindle bearings makes the testing inconvenient.
A spindle bearing thermal expansion test fixture was designed, including a fixture base, an inner cone, and expansion blocks. The expansion blocks are distributed circumferentially along the inner cone and have a certain degree of extensibility. The thermal expansion is simulated by measuring the difference between the bearing inner ring and the inner cone.
It enables convenient simulation of the thermal expansion of spindle bearings, allowing for early detection of machining defects, ensuring the reliability and stability of bearings, and providing convenient testing conditions.
Smart Images
Figure CN223910504U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of bearing thermal expansion tests, in particular to a main shaft bearing thermal expansion test tool. BACKGROUND
[0002] A main shaft is a core rotating component in a mechanical device, and a main shaft bearing is a key mechanical component for supporting the main shaft and ensuring high-speed and high-precision rotation of the main shaft. Thermal expansion is an inevitable phenomenon during assembly and use of the main shaft bearing, which directly affects the fitting clearance of the bearing and further affects the operation performance of the device.
[0003] In order to evaluate the size change and performance influence of the main shaft bearing caused by thermal expansion in a high-temperature environment, the thermal expansion of the main shaft bearing in actual work needs to be simulated. However, at present, there is no tool that can be well applied to the thermal expansion test of the main shaft bearing, resulting in inconvenience in the test. CONTENT OF THE INVENTION
[0004] In order to facilitate the thermal expansion test of the main shaft bearing by the test personnel, the application provides a main shaft bearing thermal expansion test tool.
[0005] The main shaft bearing thermal expansion test tool provided by the application adopts the following technical scheme:
[0006] The main shaft bearing thermal expansion test tool comprises a tool base, an inner cone and expansion blocks, the inner cone and the expansion blocks are arranged on the tool base, the expansion blocks are distributed in the circumferential direction of the inner cone, the inner wall of the inner cone and each expansion block is in abutment, the outer wall of the expansion block is used for abutting against the inner wall of the inner ring of the bearing to be tested, and a deformation gap is formed between adjacent expansion blocks.
[0007] Preferably, the width of the deformation gap is 3-7 mm.
[0008] Preferably, the tool further comprises height adjustment blocks, the height adjustment blocks are arranged in the circumferential direction of the tool base, each height adjustment block is detachably connected with the tool base, the height adjustment blocks are located between the inner cone and the tool base, the inner cone and the tool base are detachably connected, the outer diameter of the inner cone increases from bottom to top, and the inner wall of the expansion block is in abutment with the outer wall of the inner cone.
[0009] Preferably, the height adjustment blocks are mounted on the tool base through bolts.
[0010] Preferably, the inner cone is mounted on the tool base through bolts.
[0011] Preferably, the expansion blocks are mounted on the tool base through bolts.
[0012] Preferably, the expansion blocks are low-alloy steel blocks.
[0013] Preferably, the tool base is a circular ring, and the outer diameter of the tool base is greater than twice the distance from the side of the bulge away from the inner cone to the center of the tool base.
[0014] Preferably, the inner cone is a circular ring, and the inner diameter of the tool base is less than or equal to the inner diameter of the inner cone.
[0015] In summary, the present application has the following beneficial technical effects:
[0016] When assembling the tool, the inner cone is first fixed on the tool base, and then the plurality of bulges are sequentially installed on the tool base, so that the outer wall of the inner cone abuts against the inner wall of the bulge. During testing, the bearing inner ring to be tested is first heated to the required temperature, and then the heated bearing inner ring is placed on the tool base, so that the outer wall of the plurality of bulges abuts against the inner wall of the bearing inner ring, thereby performing the thermal expansion test. Since the bulge has a certain elasticity, the deformation gap can adapt to the expansion of the bulge to a certain extent, thereby simulating the thermal expansion of the spindle bearing in actual work. By measuring the inner diameter of the bearing inner ring and the outer diameter of the inner cone and calculating the difference between the two, the fit clearance is obtained. By analyzing the size of the fit clearance, defects in the machining process can be found in advance, ensuring the reliability and stability of the bearing in actual use, which is convenient and fast, and greatly facilitates the thermal expansion test of the spindle bearing. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.
[0018] Figure 2 is a sectional view of the overall structure of the embodiment of the present application.
[0019] Figure 3 is a schematic diagram of part of the structure of the embodiment of the present application.
[0020] Reference signs: 1, tool base; 2, inner cone; 3, bulge; 4, height adjustment block; 5, deformation gap; 6, groove; 7, bearing inner ring. DETAILED DESCRIPTION
[0021] The following will be described in detail in combination with Figures 1-3 The present application is further described in detail.
[0022] The embodiment of the present application discloses a spindle bearing thermal expansion test tool. Referring to Figure 1 and Figure 2The main shaft bearing thermal expansion test tooling includes a tooling base 1, an inner cone 2 and expansion blocks 3, wherein the tooling base 1 is a circular ring, facilitating the installation of the inner cone 2 and the expansion blocks 3; the inner cone 2 is also a circular ring to simulate a bearing assembly shaft, and the inner cone 2 and the expansion blocks 3 are fixedly installed on the tooling base 1; the expansion blocks 3 are distributed along the circumference of the inner cone 2, each expansion block 3 is a circular arc and has the same center as the tooling base 1, and the plurality of expansion blocks 3 are spliced to form a circular ring; the outer wall of the inner cone 2 abuts against the inner wall of each expansion block 3, and the outer wall of the expansion block 3 is used to abut against the inner wall of the bearing inner ring 7 to be tested, and the deformation gap 5 is provided between adjacent expansion blocks 3.
[0023] When assembling the tooling, the inner cone 2 is first fixed on the tooling base 1, and then the plurality of expansion blocks 3 are sequentially installed on the tooling base 1, so that the outer wall of the inner cone 2 abuts against the inner wall of each expansion block 3. During the test, the bearing inner ring 7 to be tested is first heated to the required temperature, and then the heated bearing inner ring 7 is placed on the tooling base 1, so that the outer wall of each expansion block 3 abuts against the inner wall of the bearing inner ring 7, thereby performing the thermal expansion test. Since the expansion blocks 3 have a certain flexibility, the deformation gap 5 can adapt to the expansion of the expansion blocks to a certain extent, thereby simulating the thermal expansion of the main shaft bearing in actual work. By measuring the inner diameter of the bearing inner ring 7 and the outer diameter of the inner cone 2 and calculating the difference between the two, the fit clearance between the bearing inner ring 7 and the assembly shaft is obtained, which helps to find defects in the processing process in advance, ensures the reliability and stability of the bearing in actual use, is convenient and fast, and greatly facilitates the thermal expansion test of the main shaft bearing.
[0024] Referring to Figure 1 and Figure 2 The outer diameter of the tooling base 1 is greater than twice the distance from the side of the expansion block 3 away from the inner cone 2 to the center of the tooling base 1, that is, the outer diameter of the tooling base 1 is greater than the outer diameter of the circular ring formed by the plurality of expansion blocks 3, which helps to provide space for the bearing inner ring 7. The inner diameter of the tooling base 1 is less than or equal to the inner diameter of the inner cone 2 to ensure uniform stress of the inner cone 2. Specifically, the inner diameter of the tooling base 1 is equal to the inner diameter of the inner cone 2. The inner cone 2 is made of 42CrMo4 material, which is also called four-two-chromium-molybdenum-four, a medium-carbon alloy structural steel with high strength, good toughness and excellent hardenability.
[0025] Referring to Figure 2 and Figure 3Each bulge 3 is bolted on the tool base 1, and the outer arc surface thereof is precisely machined to ensure the flatness of the contact surface with the inner ring 7 of the test bearing. Specifically, the tool base 1 is integrally formed with annular protrusions (not labeled in the figure), the annular protrusions are aligned with the bulges 3, and each bulge 3 is fixed on the annular protrusion of the tool base 1 by bolts. The bulges 3 are low-alloy steel blocks, and specifically, the bulges 3 are made of 42CrMo4 material, so that they have a certain elasticity.
[0026] With reference to Figure 2 and Figure 3 , the width of the deformation gap 5 is 3mm-7mm, and the width of the deformation gap 5 is 5mm in the optimal case. The width of the deformation gap 5 is 5mm in the optimal case. Under the condition of ensuring the abutting effect with the outer wall of the inner cone 2, the elasticity of the bulges 3 can be adapted to a certain extent, and the elastic deformation of the metal is usually invisible to the naked eye.
[0027] With reference to Figure 2 and Figure 3 , the tool further comprises a plurality of height adjustment blocks 4, the plurality of height adjustment blocks 4 are arranged at intervals along the circumference of the tool base 1, and each height adjustment block 4 is detachably arranged on the tool base 1. The plurality of height adjustment blocks 4 are located between the inner cone 2 and the tool base 1, and the inner cone 2 and the tool base 1 are detachably connected, so that the inner cone 2 abuts on the plurality of height adjustment blocks 4 of the tool base 1; the outer diameter of the inner cone 2 increases from bottom to top to form a conical outer wall, and the inner wall of the bulge 3 abuts with the outer wall of the inner cone 2. The height of the height adjustment block 4 has multiple specifications, which can be selected according to the test requirements.
[0028] When assembling the tool, different height adjustment blocks 4 can be installed on the tool base 1 to adjust the height of the inner cone 2 on the tool base 1, and the abutting of the conical outer wall of the inner cone 2 and the conical inner wall of the bulge 3 can change the size of the outer diameter of the circular ring surrounded by the plurality of bulges 3, so as to simulate different bearing assembly shaft diameters in a small range, improve the flexibility of the tool, and eliminate the gap between the bearing and the tool.
[0029] With reference to Figure 3 , in other embodiments, the height adjustment block 4 can slide vertically through the tool base 1, and a corresponding abutting bolt is threaded through the tool base 1, the rotation axis of the abutting bolt is perpendicular to the sliding direction of the height adjustment block 4, and the abutting bolt is used to abut or separate from the height adjustment block 4. When the height of the height adjustment block 4 needs to be adjusted, the abutting bolt is rotated to separate from the height adjustment block 4, the height adjustment block 4 is moved to the required height, and then the abutting bolt is reversely rotated to abut the corresponding height adjustment block 4, so as to directly adjust the height of the height adjustment block 4 as needed, so as to change the size of the outer diameter of the circular ring surrounded by the plurality of bulges 3.
[0030] With reference to Figure 2 And Figure 3 Further, the height adjustment block 4 is fixedly installed on the tool base 1 by bolts, so that the height adjustment block 4 is convenient and fast to disassemble and assemble; in order to facilitate the installation of the bolts, the cross section of the height adjustment block 4 is circular, and a groove 6 is formed on the side of the height adjustment block 4 away from the tool base 1, and a through hole is formed in the bottom wall of the groove 6, the bolt passes through the bottom of the tool base 1 and the through hole, and the bolt is locked by connecting a nut on the bolt rod, and the nut is located in the groove 6, so that the height adjustment block 4 does not affect the support of the inner cone 2. In other embodiments, in order to facilitate the positioning of the inner cone 2, a positioning pin can also be arranged at the bottom of the inner cone 2 to be inserted and matched with the groove 6.
[0031] With reference to Figure 2 Figure 3 In order to facilitate the quick disassembly and assembly of the inner cone 2, the inner cone 2 is detachably connected with the tool base 1, and the inner cone 2 is installed on the tool base 1 by a plurality of bolts, and the inner cone 2 is stably installed on the tool base 1 by arranging a plurality of bolts in the circumferential direction of the inner cone 2. In other embodiments, the inner cone 2 and the tool base 1 can also be connected by a rivet, and the inner cone 2 and the tool base 1 can also be detachable.
[0032] The implementation principle of the embodiment of the present application is that: when assembling the tool, first, a plurality of height adjustment blocks 4 with the required height are respectively installed and fixed on the tool base 1 by bolts, then the inner cone 2 is placed above the plurality of height adjustment blocks 4, the inner cone 2 is fixed with the tool base 1 by a plurality of bolts, and then the plurality of expansion blocks 3 are fixed on the annular protrusion of the tool base 1 along the circumferential direction of the inner cone 2 by bolts or screws, so that the outer wall of the inner cone 2 abuts against the inner wall of the plurality of expansion blocks 3; since the height adjustment block 4 supports the inner cone 2 at the required height, the outer diameter of the circular ring surrounded by the plurality of expansion blocks 3 is the required size through the cooperation of the conical outer wall of the inner cone 2 and the inner wall of the expansion block 3, thereby simulating the diameter of the bearing assembly shaft of the required specification.
[0033] During the test, first, the bearing inner ring 7 to be tested is heated to the required temperature, and then the heated bearing inner ring 7 is placed on the tool base 1, so that the outer walls of the plurality of expansion blocks 3 abut against the inner wall of the bearing inner ring 7, thereby performing the thermal expansion test, which can simulate the thermal expansion of the main shaft bearing in actual work, the difference between the inner diameter of the bearing inner ring 7 and the outer diameter of the inner cone 2 is calculated by measuring the inner diameter of the bearing inner ring 7 and the outer diameter of the inner cone 2, thereby obtaining the fit clearance between the bearing and the tool, and analyzing the fit clearance is helpful to analyze the performance and assembly of the bearing. The whole test process is simple in operation and high in measurement accuracy, can effectively solve the problem of change of fit clearance caused by thermal expansion of the main shaft bearing during assembly and use, can find potential processing defects in advance, can ensure the reliability and stability of the bearing in actual use, and greatly provides convenience for the thermal expansion test of the main shaft bearing.
[0034] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.
Claims
1. A main shaft bearing thermal expansion test fixture characterized by: The tooling base (1), the inner cone (2) and the expansion block (3), the inner cone (2) and the expansion block (3) are arranged on the tooling base (1), the expansion block (3) is distributed along the circumference of the inner cone (2), the inner wall of each expansion block (3) is in close contact with the inner cone (2), the outer wall of the expansion block (3) is used for abutting with the inner wall of the bearing inner ring (7) to be tested, and the deformation gap (5) is arranged between adjacent expansion blocks (3).
2. The spindle bearing thermal expansion test fixture of claim 1, wherein: The width of the deformation gap (5) is 3-7mm.
3. The spindle bearing thermal expansion test fixture of claim 1, wherein: The tooling also includes a height adjusting block (4), the height adjusting block (4) is arranged along the circumference of the tooling base (1), each height adjusting block (4) is detachably connected with the tooling base (1), the height adjusting block (4) is located between the inner cone (2) and the tooling base (1), the inner cone (2) and the tooling base (1) are detachably connected, the outer diameter of the inner cone (2) increases from bottom to top, and the inner wall of the expansion block (3) is in close contact with the outer wall of the inner cone (2).
4. The main shaft bearing thermal expansion test fixture of claim 3, wherein: The height adjusting block (4) is installed on the tooling base (1) by bolts.
5. The spindle bearing thermal expansion test fixture of claim 3, wherein: The inner cone (2) is installed on the tooling base (1) by bolts.
6. The spindle bearing thermal expansion test fixture of claim 1, wherein: The expansion block (3) is installed on the tooling base (1) by bolts.
7. The spindle bearing thermal expansion test fixture of claim 1, wherein: The expansion block (3) is a low alloy steel block.
8. The spindle bearing thermal expansion test fixture of claim 1, wherein: The tooling base (1) is a circular ring, and the outer diameter of the tooling base (1) is greater than twice the distance from the side of the expansion block (3) away from the inner cone (2) to the center of the tooling base (1).
9. The main shaft bearing thermal expansion test fixture of claim 8, wherein: The inner cone (2) is a circular ring, and the inner diameter of the tooling base (1) is less than or equal to the inner diameter of the inner cone (2). The inner cone (2) is a circular ring, and the inner diameter of the tooling base (1) is less than or equal to the inner diameter of the inner cone (2).