Method for processing inner diameter and outer diameter size of non-magnetic bearing ring

Abstract

The present application belongs to the technical field of bearing processing, and particularly relates to a magnetic-free bearing ring inner diameter and outer diameter size processing method. Step one, a magnetic fixture is made and assembled on one side of a bearing ring blank, the magnetic fixture is in interference fit with the inner diameter surface or the outer diameter surface of the bearing ring blank, so that the magnetic fixture and the bearing ring blank are fixed as a whole, and the magnetic fixture is adsorbed on a positioning cylinder of an electromagnetic centerless clamp. Step two, the bearing ring blank is processed, so that the processing size of the positioning side of the bearing ring blank assembled with the magnetic fixture is not equal to the processing size of the non-positioning side of the bearing ring blank without the magnetic fixture, and the processing size of the positioning side of the bearing ring blank smoothly transitions to the processing size of the non-positioning side of the bearing ring blank. Step three, the fixture is removed, and the magnetic fixture is separated from the bearing ring blank. Through the design of the magnetic fixture, the positioning problem of the magnetic-free bearing ring is overcome, and the inner diameter and outer diameter sizes on both sides of the magnetic-free bearing ring after the fixture is removed are ensured to be within the qualified range and substantially the same.

Description

Technical Field

[0001] This invention belongs to the field of bearing processing technology, specifically relating to a method for processing the inner and outer diameter dimensions of a non-magnetic bearing race. Background Technology

[0002] When grinding the outer diameter of bearing rings, they are usually fixed by an electromagnetic centerless chuck. However, for some bearings with complex working environments, it is necessary to ensure that the rings remain non-magnetic during the machining process to avoid difficulties in subsequent demagnetization and affect the bearing accuracy. Therefore, a non-magnetic bearing ring inner and outer diameter machining method is needed to ensure that the bearing rings can avoid the influence of the electromagnetic centerless chuck during the machining process and remain non-magnetic. Summary of the Invention

[0003] In view of the defects of the prior art, the purpose of the present invention is to provide a method for machining the inner and outer diameters of a non-magnetic bearing ring, ensuring that the bearing ring remains non-magnetic during the machining process, while ensuring the machining accuracy of the inner and outer diameters of the bearing ring.

[0004] To achieve the above objectives, the technical solution adopted by this invention is a method for machining the inner and outer diameters of a non-magnetic bearing ring, comprising the following steps:

[0005] Step 1: Make a magnetic fixture and assemble the magnetic fixture onto one side of the bearing ring blank. The magnetic fixture and the inner or outer diameter surface of the bearing ring blank are interference-fitted to fix the magnetic fixture and the bearing ring blank into one piece. Then, attach the magnetic fixture to the positioning cylinder of the electromagnetic centerless clamp.

[0006] Step 2: Machining the bearing ring blank, so that the machining dimension of the positioning side of the bearing ring blank equipped with the magnetic tool is not equal to the machining dimension of the non-positioning side of the bearing ring blank without the magnetic tool, and the machining dimension of the positioning side of the bearing ring blank smoothly transitions to the machining dimension of the non-positioning side of the bearing ring blank.

[0007] Step 3: Remove the tire, separating the magnetic tire tool from the bearing ring blank.

[0008] Furthermore, the magnetic fixture has a ring-shaped structure, and a stepped positioning groove is formed on one side of the positioning surface of the magnetic fixture. The magnetic fixture is interference-fitted with the inner or outer diameter surface of one side of the bearing ring blank through the stepped positioning groove.

[0009] Furthermore, in step one, the magnetic jig is heated to the bearing ring blank, and after cooling, the parallelism difference of the ring end face after installation is measured. After passing the test, the magnetic jig is adsorbed onto the positioning cylinder of the electromagnetic centerless clamp.

[0010] Furthermore, in step two, when machining the bearing ring blank, the difference between the machining dimension of the locating side of the bearing ring blank and the machining dimension of the non-locating side of the bearing ring blank is equal to the interference fit between the magnetic jig and the bearing ring blank.

[0011] Furthermore, in step two, the surface formed by machining the bearing ring blank is a conical surface, and the taper of the conical surface is equal to the interference fit between the magnetic die and the bearing ring blank.

[0012] Furthermore, in step three, the dimensions of both sides of the bearing ring blank after tire removal must be consistent.

[0013] Furthermore, the machining of the outer diameter of the non-magnetic bearing outer ring includes the following steps:

[0014] Step 1: Fabricate a magnetic jig. Warmly assemble the magnetic jig onto one side of the inner diameter of the bearing outer ring blank. The magnetic jig and the inner diameter surface of one side of the bearing outer ring blank are interference-fitted, fixing the magnetic jig and the bearing outer ring blank as a single unit. After cooling, measure the parallelism difference of the ring end faces after installation. After passing the inspection, attach the magnetic jig to the positioning cylinder of the electromagnetic centerless clamp. The magnetic jig has a ring-shaped structure, with a stepped positioning groove formed on one side of its outer diameter. The outer diameter surface of the magnetic jig is interference-fitted with the inner diameter surface of one side of the bearing outer ring blank through the stepped positioning groove.

[0015] Step 2: Grind the outer diameter of the bearing outer ring blank so that the outer diameter of the bearing outer ring blank with the magnetic tool is larger than the outer diameter of the bearing outer ring blank without the magnetic tool. The difference between the outer diameter and machining dimension of the outer diameter of the bearing outer ring blank with the positioning side and the outer diameter of the bearing outer ring blank without the magnetic tool is equal to the interference fit between the magnetic tool and the bearing outer ring blank. The outer diameter surface of the bearing outer ring blank is machined into a conical surface, and the taper is the interference fit between the magnetic tool and the bearing outer ring blank, so that the outer diameter machining dimension of the bearing outer ring blank with the positioning side transitions smoothly to the outer diameter machining dimension of the bearing outer ring blank with the non-positioning side.

[0016] Step 3: Remove the tire. Separate the magnetic tire from the bearing outer ring blank. The outer diameter dimensions on both sides of the bearing outer ring blank after removal of the tire can be kept consistent.

[0017] Furthermore, the machining of the inner diameter of the inner ring of a non-magnetic bearing includes the following steps:

[0018] Step 1: Fabricate a magnetic jig. Warmly assemble the magnetic jig onto one side of the outer diameter of the bearing inner ring blank. The magnetic jig and the outer diameter surface of the bearing inner ring blank are interference-fitted, fixing the magnetic jig and the bearing inner ring blank as a single unit. After cooling, measure the parallelism difference of the ring end faces after installation. After passing the inspection, attach the magnetic jig to the positioning cylinder of the electromagnetic centerless clamp. The magnetic jig has a ring-shaped structure, with a stepped positioning groove formed on one side of its inner diameter. The magnetic jig's inner diameter surface at the stepped positioning groove is interference-fitted with the outer diameter surface of the bearing inner ring blank.

[0019] Step 2: Grind the inner diameter of the bearing inner ring blank so that the inner diameter of the bearing inner ring blank with the magnetic tool is smaller than the inner diameter of the bearing inner ring blank without the magnetic tool. The difference between the inner diameter of the bearing inner ring blank with the magnetic tool and the inner diameter of the bearing inner ring blank with the magnetic tool is equal to the interference fit between the magnetic tool and the bearing inner ring blank. The inner diameter surface of the bearing inner ring blank is machined into a conical surface, and the taper is the interference fit between the magnetic tool and the bearing inner ring blank, so that the inner diameter of the bearing inner ring blank with the magnetic tool smoothly transitions to the inner diameter of the bearing inner ring blank with the magnetic tool.

[0020] Step 3: Remove the tire. Separate the magnetic tire from the bearing inner ring blank. The inner diameter dimensions on both sides of the bearing inner ring blank after tire removal can be kept consistent.

[0021] The beneficial effects of this invention are as follows: This invention overcomes the clamping and positioning problem during the processing of non-magnetic bearing rings by designing a magnetic fixture, and determines the processing method of the inner diameter and outer diameter taper of the non-magnetic bearing ring with fixture by the interference fit between the magnetic fixture and the non-magnetic bearing ring, ensuring that the inner diameter and outer diameter dimensions of the non-magnetic bearing ring are within the qualified range and are basically the same after the fixture is removed. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a magnetic mold structure;

[0023] Figure 2 This is a schematic diagram of the outer ring structure of a non-magnetic bearing;

[0024] Figure 3 Diagram showing the assembly of a magnetic jig and a non-magnetic bearing outer ring;

[0025] Figure 4 This is a diagram showing the variation in the outer ring dimensions of a non-magnetic bearing with a fixture.

[0026] Figure 5 The diagram shows the change in the outer diameter of the bearing ring after the tire is removed, indicating that the outer diameters on both sides of the non-magnetic bearing ring are machined to be the same.

[0027] Figure 6 This is a schematic diagram showing the machining of the outer diameter of the non-magnetic bearing ring after assembly in this embodiment;

[0028] In the figure: 1. Magnetic jig, 101. Outer diameter surface of stepped positioning slot, 2. Bearing outer ring, 201. Outer diameter surface of bearing outer ring, 202. Inner diameter surface of bearing outer ring;

[0029] A. Outer diameter of one side of the mounting fixture. Detailed Implementation

[0030] To make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0031] Example 1

[0032] See appendix Figure 1-3 To overcome the positioning problem during the grinding of the outer ring of a non-magnetic bearing, a magnetic fixture matching the outer ring of the non-magnetic bearing is designed. The fixture is installed by interference fit of the inner and outer diameters of the stepped positioning slot and the ring, and the magnetic fixture is adsorbed onto the positioning cylinder to realize the grinding of the outer ring of the non-magnetic bearing.

[0033] During production and processing, the following problems were found in the machining of the outer ring of the non-magnetic bearing with fixture: after disassembling the fixture, the outer diameter of the bearing outer ring on the fixture side was found to be out of tolerance, and the outer diameter taper was large.

[0034] Because the outer diameter of the jig and the inner diameter of the outer ring are an interference fit, the outer diameter of the bearing outer ring on the jig-equipped side expands outward due to the interference, resulting in a taper. The change in the outer diameter of the bearing ring after jig assembly is shown in the figure. Figure 4 At this time, the outer diameter D1 of one side of the mounting fixture is greater than the outer diameter D of the other side.

[0035] The outer diameter of the bearing outer ring is controlled according to conventional machining methods in this state, and the outer diameter dimensions on both sides are machined to be the same. The change in the outer diameter dimension of the ring after unloading is shown in the figure. Figure 5 At this time, the outer diameter D3 of one side of the mounting fixture is smaller than the outer diameter D of the other side.

[0036] from Figure 4 , Figure 5 The outer diameter status shows that:

[0037] 1. The outer diameter of the side without the fixture did not change during the installation and removal of the fixture;

[0038] 2. The outer diameter of one side of the tire loading tool is affected by the interference fit, and the outer diameter changes before and after tire removal, which is the main reason for the taper.

[0039] Analysis and verification showed that the main cause of the taper was the interference fit between the fixture and the bearing ring. However, to ensure the non-magnetic outer ring of the bearing is stably assembled on the electromagnetic centerless jig, the interference fit between the fixture and the bearing ring is a necessary condition for machining the non-magnetic bearing outer ring. Therefore, to ensure that the outer diameter of the non-magnetic bearing outer ring is qualified after removal from the fixture, it is imperative to invent a method to control the outer diameter of the non-magnetic bearing outer ring. The specific method adopted in this embodiment is as follows:

[0040] The machining method for the outer diameter of the outer ring of a non-magnetic bearing includes the following steps:

[0041] Step 1: Fabricate a magnetic jig. Warmly assemble the magnetic jig onto one side of the inner diameter of the bearing outer ring blank. The magnetic jig and the inner diameter surface of the bearing outer ring blank are interference-fitted to fix the magnetic jig and the bearing outer ring blank into one piece. After cooling, measure the parallelism difference of the end face of the ring after installation. After passing the inspection, the magnetic jig is adsorbed onto the positioning cylinder of the electromagnetic centerless clamp.

[0042] Step 2: Grind the outer diameter of the bearing outer ring blank so that the outer diameter of the bearing outer ring blank with the magnetic tool is larger than the outer diameter of the bearing outer ring blank without the magnetic tool. The difference between the outer diameter and machining dimension of the outer diameter of the bearing outer ring blank with the positioning side and the outer diameter of the bearing outer ring blank without the magnetic tool is equal to the interference fit between the magnetic tool and the bearing outer ring blank. The outer diameter surface of the bearing outer ring blank is machined into a conical surface, and the taper is the interference fit between the magnetic tool and the bearing outer ring blank, so that the outer diameter machining dimension of the bearing outer ring blank with the positioning side transitions smoothly to the outer diameter machining dimension of the bearing outer ring blank with the non-positioning side.

[0043] Step 3: Remove the tire. Separate the magnetic tire from the bearing outer ring blank. The outer diameter dimensions on both sides of the bearing outer ring blank after removal of the tire can be kept consistent.

[0044] Furthermore, the magnetic fixture has a ring-shaped structure, and a stepped positioning groove is formed on one side of the outer diameter of the magnetic fixture. The outer diameter surface of the magnetic fixture at the stepped positioning groove is interference-fitted with the inner diameter surface on one side of the bearing outer ring blank.

[0045] Principle: After the tire ring is assembled, the outer diameter is controlled by taper, that is, the outer diameter on one side of the tire mounting tool is controlled to be different from the outer diameter on the other side, so as to ensure that the outer diameter on both sides is basically the same after the tire is removed.

[0046] Method for determining outer diameter taper:

[0047] The increase in the outer diameter of the jig side after the ring is assembled is equal to the interference fit.

[0048] Interference = d2 - D2, where d2 is the outer diameter of the magnetic die positioning slot and D2 is the outer diameter of the bearing outer ring blank.

[0049] Taper equals interference, i.e., taper = d2 - D2.

[0050] Method for determining the outer diameter of one side of the jig:

[0051] The machining dimension D of the outer diameter of the bearing outer ring blank on the side without the fixture (the machining dimension of the outer diameter of the bearing outer ring blank on the non-locating side) is machined according to the standard dimension. The machining dimension D1 of the outer diameter on the side with the fixture (the machining dimension of the outer diameter of the bearing outer ring blank on the locating side) is controlled by the taper, where taper = D1 - D. The outer diameter D1 of the side with the fixture is calculated according to the formula: D1 = D + taper. Figure 6 As shown.

[0052] For example:

[0053] Standard requirement for outer diameter of the ferrule: ∅72 (0~-0.011) mm;

[0054] Interference allowance: 0.006mm;

[0055] Taper = Interference = 0.006mm;

[0056] The outer diameter of the side without the tire fixture is machined according to ∅72-0.007mm. Then the outer diameter of the side with the tire fixture is equal to ∅72-0.007mm+0.006mm=∅72-0.001mm. After removing the tire, the outer diameter of both sides is basically ∅72-0.007mm.

[0057] The key point of this invention is the machining method of determining the outer diameter taper of the non-magnetic bearing ring with the fixture by the interference fit between the fixture and the non-magnetic bearing ring, so as to ensure that the outer diameter dimensions on both sides of the non-magnetic bearing ring are within the qualified range and are basically the same after the fixture is removed.

[0058] Example 2

[0059] Example 2 is based on the same principle as Example 1. Due to the shrinkage of the inner diameter surface of the bearing inner ring blank on the side with the fixture, related figures are omitted. The specific processing procedure for controlling the inner diameter of the non-magnetic bearing inner ring with fixture in this example is as follows:

[0060] The machining method for the inner diameter of the inner ring of a non-magnetic bearing includes the following steps:

[0061] Step 1: Make a magnetic jig. Warmly assemble the magnetic jig onto one side of the outer diameter of the inner ring blank of the bearing. The magnetic jig and the outer diameter surface of the inner ring blank of the bearing are interference fit, so that the magnetic jig and the inner ring blank of the bearing are fixed together. After cooling, measure the parallelism difference of the end face of the ring after installation. After passing the test, the magnetic jig is adsorbed onto the positioning cylinder of the electromagnetic centerless clamp.

[0062] Step 2: Grind the inner diameter of the bearing inner ring blank so that the inner diameter of the bearing inner ring blank with the magnetic tool is smaller than the inner diameter of the bearing inner ring blank without the magnetic tool. The difference between the inner diameter of the bearing inner ring blank with the magnetic tool and the inner diameter of the bearing inner ring blank with the magnetic tool is equal to the interference fit between the magnetic tool and the bearing inner ring blank. The inner diameter surface of the bearing inner ring blank is machined into a conical surface, and the taper is the interference fit between the magnetic tool and the bearing inner ring blank, so that the inner diameter of the bearing inner ring blank with the magnetic tool smoothly transitions to the inner diameter of the bearing inner ring blank with the magnetic tool.

[0063] Step 3: Remove the tire. Separate the magnetic tire from the bearing inner ring blank. The inner diameter dimensions on both sides of the bearing inner ring blank after tire removal can be kept consistent.

[0064] Furthermore, the magnetic fixture has a circular structure, and a stepped positioning groove is formed on the inner diameter of one side of the magnetic fixture. The magnetic fixture is interference-fitted with the outer diameter of the inner ring blank of the bearing through the inner diameter surface of the stepped positioning groove.

[0065] It should be noted that the parts of this invention not described in detail are prior art.

[0066] The above examples are merely preferred embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A method for machining the inner and outer diameters of a non-magnetic bearing race, characterized in that, Includes the following steps: Step 1: Make a magnetic fixture and assemble the magnetic fixture onto one side of the bearing ring blank. The magnetic fixture and the inner or outer diameter surface of the bearing ring blank are interference-fitted to fix the magnetic fixture and the bearing ring blank into one piece. Then, attach the magnetic fixture to the positioning cylinder of the electromagnetic centerless clamp. Step 2: Machining the bearing ring blank, so that the machining dimension of the positioning side of the bearing ring blank equipped with the magnetic tool is not equal to the machining dimension of the non-positioning side of the bearing ring blank without the magnetic tool, and the machining dimension of the positioning side of the bearing ring blank smoothly transitions to the machining dimension of the non-positioning side of the bearing ring blank. Step 3: Remove the tire, separating the magnetic tire tool from the bearing ring blank.

2. The method for machining the inner and outer diameters of the non-magnetic bearing rings according to claim 1, characterized in that: The magnetic fixture has a ring-shaped structure, and a stepped positioning groove is formed on one side of the positioning surface of the magnetic fixture. The magnetic fixture is interference-fitted with the inner or outer diameter surface of one side of the bearing ring blank through the stepped positioning groove.

3. The method for machining the inner and outer diameters of the non-magnetic bearing rings according to claim 1, characterized in that: In step one, the magnetic jig is heated to the bearing ring blank, and after cooling, the parallelism difference of the ring end face is measured. After passing the test, the magnetic jig is adsorbed onto the positioning cylinder of the electromagnetic centerless clamp.

4. The method for machining the inner and outer diameters of the non-magnetic bearing rings according to claim 1, characterized in that: In step two, when machining the bearing ring blank, the difference between the machining dimension of the locating side of the bearing ring blank and the machining dimension of the non-locating side of the bearing ring blank is equal to the interference fit between the magnetic jig and the bearing ring blank.

5. The method for machining the inner and outer diameters of the non-magnetic bearing rings according to claim 1, characterized in that: In step two, the surface formed by machining the bearing ring blank is a conical surface, and the taper of the conical surface is equal to the interference fit between the magnetic die and the bearing ring blank.

6. The method for machining the inner and outer diameters of the non-magnetic bearing rings according to any one of claims 1-5, characterized in that: In step three, the dimensions of both sides of the bearing ring blank after unloading must be consistent.

7. The method for machining the inner and outer diameters of the non-magnetic bearing rings according to any one of claims 1-5, characterized in that: The machining process for the outer diameter of a non-magnetic bearing includes the following steps: Step 1: Fabricate a magnetic jig. Warmly assemble the magnetic jig onto one side of the inner diameter of the bearing outer ring blank. The magnetic jig and the inner diameter surface of one side of the bearing outer ring blank are interference-fitted, fixing the magnetic jig and the bearing outer ring blank as a single unit. After cooling, measure the parallelism difference of the ring end faces after installation. After passing the inspection, attach the magnetic jig to the positioning cylinder of the electromagnetic centerless clamp. The magnetic jig has a ring-shaped structure, with a stepped positioning groove formed on one side of its outer diameter. The outer diameter surface of the magnetic jig is interference-fitted with the inner diameter surface of one side of the bearing outer ring blank through the stepped positioning groove. Step 2: Grind the outer diameter of the bearing outer ring blank so that the outer diameter of the bearing outer ring blank with the magnetic tool is larger than the outer diameter of the bearing outer ring blank without the magnetic tool. The difference between the outer diameter and machining dimension of the outer diameter of the bearing outer ring blank with the positioning side and the outer diameter of the bearing outer ring blank without the magnetic tool is equal to the interference fit between the magnetic tool and the bearing outer ring blank. The outer diameter surface of the bearing outer ring blank is machined into a conical surface, and the taper is the interference fit between the magnetic tool and the bearing outer ring blank, so that the outer diameter machining dimension of the bearing outer ring blank with the positioning side transitions smoothly to the outer diameter machining dimension of the bearing outer ring blank with the non-positioning side. Step 3: Remove the tire. Separate the magnetic tire from the bearing outer ring blank. The outer diameter dimensions on both sides of the bearing outer ring blank after removal of the tire can be kept consistent.

8. The method for machining the inner and outer diameters of the non-magnetic bearing rings according to any one of claims 1-5, characterized in that: The machining process for the inner diameter of a non-magnetic bearing includes the following steps: Step 1: Fabricate a magnetic jig. Warmly assemble the magnetic jig onto one side of the outer diameter of the bearing inner ring blank. The magnetic jig and the outer diameter surface of the bearing inner ring blank are interference-fitted, fixing the magnetic jig and the bearing inner ring blank as a single unit. After cooling, measure the parallelism difference of the ring end faces after installation. After passing the inspection, attach the magnetic jig to the positioning cylinder of the electromagnetic centerless clamp. The magnetic jig has a ring-shaped structure, with a stepped positioning groove formed on one side of its inner diameter. The magnetic jig's inner diameter surface at the stepped positioning groove is interference-fitted with the outer diameter surface of the bearing inner ring blank. Step 2: Grind the inner diameter of the bearing inner ring blank so that the inner diameter of the bearing inner ring blank with the magnetic tool is smaller than the inner diameter of the bearing inner ring blank without the magnetic tool. The difference between the inner diameter of the bearing inner ring blank with the magnetic tool and the inner diameter of the bearing inner ring blank with the magnetic tool is equal to the interference fit between the magnetic tool and the bearing inner ring blank. The inner diameter surface of the bearing inner ring blank is machined into a conical surface, and the taper is the interference fit between the magnetic tool and the bearing inner ring blank, so that the inner diameter of the bearing inner ring blank with the magnetic tool smoothly transitions to the inner diameter of the bearing inner ring blank with the magnetic tool. Step 3: Remove the tire. Separate the magnetic tire from the bearing inner ring blank. The inner diameter dimensions on both sides of the bearing inner ring blank after tire removal can be kept consistent.

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