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

Abstract

The invention belongs to the technical field of bearing machining, and particularly relates to a non-magnetic bearing ring inner diameter and outer diameter size machining method which comprises the steps that firstly, a magnetic clamping fixture is manufactured and assembled on one side of a bearing ring blank body, the magnetic clamping fixture is in interference fit with the inner diameter face or the outer diameter face of the bearing ring blank body, the magnetic clamping fixture and the bearing ring blank body are fixed into a whole, and the bearing ring blank body is fixed into a whole; the magnetic mould is attracted to a positioning cylinder of the electromagnetic centerless clamp; secondly, the bearing ring blank is machined, so that the machining size of the positioning side, provided with the magnetic mould, of the bearing ring blank is not equal to the machining size of the non-positioning side, not provided with the magnetic mould, of the bearing ring blank, and the machining size of the positioning side of the bearing ring blank is in smooth transition to the machining size of the non-positioning side of the bearing ring blank; and 3, tire unloading is conducted, specifically, the magnetic mold is separated from the bearing ring blank. By designing the magnetic mould, the positioning problem of the non-magnetic bearing ring is solved, and the inner diameter and the outer diameter of the non-magnetic bearing ring are ensured to be within a qualified range and are basically the same after the mould is unloaded.

Description

Technical Field

[0001] The invention belongs to the technical field of bearing processing, and in particular relates to a method for processing the inner diameter and outer diameter dimensions of a non-magnetic bearing ring. Background Art

[0002] The outer diameter of the bearing ring is usually fixed by an electromagnetic centerless fixture during grinding. However, for some bearings with complex working environments, it is necessary to ensure that the ring remains in a non-magnetic state during the processing to avoid subsequent demagnetization difficulties and affect the bearing accuracy. Therefore, a method for processing the inner and outer diameter dimensions of the non-magnetic bearing ring is required to ensure that the bearing ring can avoid the influence of the electromagnetic centerless fixture during the processing and remain in a non-magnetic state. Summary of the invention

[0003] In view of the defects of the above-mentioned prior art, the purpose of the present invention is to provide a method for processing the inner diameter and outer diameter of a non-magnetic bearing ring, thereby ensuring that the bearing ring remains in a non-magnetic state during the processing, while ensuring the processing accuracy of the inner diameter and outer diameter of the bearing ring.

[0004] To achieve the above object, the technical solution adopted by the present invention is a method for processing the inner diameter and outer diameter of a non-magnetic bearing ring, comprising the following steps: Step 1: Make a magnetic mold, assemble the magnetic mold on one side of the bearing ring embryo, the magnetic mold is interference fit with the inner diameter surface or outer diameter surface of the bearing ring embryo, so that the magnetic mold and the bearing ring embryo are fixed as a whole, and the magnetic mold is adsorbed on the positioning cylinder of the electromagnetic centerless clamp; Step 2: Processing the bearing ring embryo body so that the processing size of the positioning side of the bearing ring embryo body equipped with the magnetic mold is not equal to the processing size of the non-positioning side of the bearing ring embryo body not equipped with the magnetic mold, and the processing size of the positioning side of the bearing ring embryo body smoothly transitions to the processing size of the non-positioning side of the bearing ring embryo body; Step 3: Remove the tire and separate the magnetic tire mold from the bearing ring blank.

[0005] Furthermore, the magnetic mold is a circular ring structure, and a stepped positioning groove is formed on a positioning surface on one side of the magnetic mold. The magnetic mold is interference fit with the inner diameter surface or outer diameter surface of one side of the bearing ring blank through the stepped positioning groove.

[0006] Furthermore, in step one, the magnetic mold and the bearing ring blank are warm installed, and after cooling, the parallelism difference of the ring end faces after installation is measured. After passing the inspection, the magnetic mold is adsorbed on the positioning cylinder of the electromagnetic centerless fixture.

[0007] Furthermore, in step 2, when processing the bearing ring blank, the difference between the processing size of the positioning side of the bearing ring blank and the processing size of the non-positioning side of the bearing ring blank is equal to the assembly interference between the magnetic mold and the bearing ring blank.

[0008] Furthermore, in step 2, the surface formed by machining the bearing ring blank is a conical surface, and the taper of the conical surface is equal to the assembly interference between the magnetic mold and the bearing ring blank.

[0009] Furthermore, in step three, the dimensions of both sides of the bearing ring blank after the tire is removed should remain consistent.

[0010] Furthermore, when processing the outer diameter of the outer ring of the non-magnetic bearing, the following steps are included: Step 1, make a magnetic mold, warm-fit the magnetic mold to one side of the inner diameter of the outer ring embryo of the bearing, the magnetic mold and the inner diameter surface of one side of the outer ring embryo of the bearing are interference-fitted, so that the magnetic mold and the outer ring embryo of the bearing are fixed as a whole, and after cooling, measure the parallelism difference of the end face of the ring after installation, and adsorb the magnetic mold on the positioning cylinder of the electromagnetic centerless clamp after passing the inspection; the magnetic mold is a circular ring structure, and a stepped positioning notch is formed on the outer diameter of one side of the magnetic mold. The outer diameter surface of the magnetic mold at the stepped positioning notch is interference-fitted with the inner diameter surface of one side of the outer ring embryo of the bearing; Step 2: Grind the outer diameter of the bearing outer ring embryo so that the outer diameter processing size of the positioning side of the bearing outer ring embryo equipped with the magnetic mold is larger than the outer diameter processing size of the non-positioning side of the bearing outer ring embryo not equipped with the magnetic mold. The difference between the outer diameter and processing size of the positioning side of the bearing outer ring embryo and the outer diameter processing size of the non-positioning side of the bearing outer ring embryo is equal to the assembly interference between the magnetic mold and the bearing outer ring embryo. The outer diameter surface of the bearing outer ring embryo is processed to form a conical surface. The taper is the assembly interference between the magnetic mold and the bearing outer ring embryo, so that the outer diameter processing size of the positioning side of the bearing outer ring embryo is smoothly transitioned to the outer diameter processing size of the non-positioning side of the bearing outer ring embryo; Step three: unloading the tire, separating the magnetic tire mold from the bearing outer ring blank, and the outer diameters of both sides of the bearing outer ring blank can remain consistent after unloading the tire.

[0011] Furthermore, when processing the inner diameter of the inner ring of the non-magnetic bearing, the following steps are included: Step 1, make a magnetic mold, warm-fit the magnetic mold to one side of the outer diameter of the inner ring blank of the bearing, the magnetic mold and the outer diameter surface of one side of the inner ring blank of the bearing are interference-fitted, so that the magnetic mold and the inner ring blank of the bearing are fixed as a whole, and after cooling, measure the parallelism difference of the end face of the ring after installation, and adsorb the magnetic mold on the positioning cylinder of the electromagnetic centerless clamp after passing the inspection; the magnetic mold is a circular ring structure, and a stepped positioning notch is formed on the inner diameter of one side of the magnetic mold. The magnetic mold is interference-fitted with the outer diameter surface of one side of the inner ring blank of the bearing through the inner diameter surface at the stepped positioning notch; Step 2: Grind the inner diameter of the bearing inner ring embryo body so that the inner diameter processing size of the positioning side of the bearing inner ring embryo body equipped with the magnetic mold is smaller than the inner diameter processing size of the non-positioning side of the bearing inner ring embryo body not equipped with the magnetic mold. The difference between the inner diameter processing size of the positioning side of the bearing inner ring embryo body and the inner diameter processing size of the non-positioning side of the bearing inner ring embryo body is equal to the assembly interference between the magnetic mold and the bearing inner ring embryo body. The inner diameter surface of the bearing inner ring embryo body is processed to form a conical surface. The taper is the assembly interference between the magnetic mold and the bearing inner ring embryo body, so that the inner diameter processing size of the positioning side of the bearing inner ring embryo body is smoothly transitioned to the inner diameter processing size of the non-positioning side of the bearing inner ring embryo body. Step 3: Remove the tire and separate the magnetic tire mold from the bearing inner ring blank. After removing the tire, the inner diameters of both sides of the bearing inner ring blank can remain consistent.

[0012] The beneficial effects of the present invention are as follows: the present invention overcomes the clamping and positioning problems during the processing of non-magnetic bearing rings by designing a magnetic jig, and determines the processing method of the inner diameter and outer diameter taper of the non-magnetic bearing ring with a jig by the interference fit between the magnetic jig and the non-magnetic bearing ring, thereby ensuring that the dimensions of the inner diameter and outer diameter of the non-magnetic bearing ring after unloading are within the qualified range and are basically the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of a magnetic mold; Figure 2 This is a schematic diagram of the outer ring structure of a non-magnetic bearing; Figure 3 A diagram of the assembly of a magnetic jig and a non-magnetic bearing outer ring; Figure 4 This is the dimension change diagram of the outer ring of the non-magnetic bearing with tire; Figure 5 The outer diameters of both sides of the outer ring of the non-magnetic bearing are processed to the same size, and the outer diameter size change diagram of the ring after tire removal; Figure 6 This is a schematic diagram of the outer diameter processing of the non-magnetic bearing ring after assembly in this embodiment; In the figure: 1, magnetic mold, 101, outer diameter surface at stepped positioning notch, 2, bearing outer ring, 201, outer diameter surface of bearing outer ring, 202, inner diameter surface of bearing outer ring; A. Outer diameter of one side of the tire fixture. DETAILED DESCRIPTION

[0014] In order 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 in conjunction with the accompanying drawings in the embodiments of the present invention.

[0015] Example 1 See attached Figure 1-3In order to overcome the positioning problem during the grinding of the outer ring of the non-magnetic bearing, a magnetic jig matching the outer ring of the non-magnetic bearing is designed. The jig is installed through the inner and outer diameters of the stepped positioning grooves and the interference fit of the ring. The magnetic jig is adsorbed on the positioning cylinder to realize the grinding of the outer ring of the non-magnetic bearing.

[0016] During production and processing, it was found that the following problems existed in the processing of the outer ring of the non-magnetic bearing with the jig: after the jig was disassembled and the outer diameter size was tested, it was found that the outer diameter size of the bearing outer ring on the side with the jig was out of tolerance and the outer diameter taper was large.

[0017] Since there is an interference fit between the outer diameter of the jig and the inner diameter of the outer ring, the outer diameter of the outer ring of the bearing on the side where the jig is installed will expand outward as a whole due to the interference fit, and the outer diameter will taper. Figure 4 At this time, the outer diameter D1 on one side of the tire is larger than the outer diameter D on the other side.

[0018] The outer diameter of the bearing outer ring is controlled in the conventional processing method at this state, and the outer diameters on both sides are processed to the same size. The change of the outer diameter of the ring after the tire is removed is shown in Figure 5 At this time, the outer diameter D3 of one side of the tire is smaller than the outer diameter D of the other side.

[0019] from Figure 4 , Figure 5 From the outer diameter of the outer ring, we can see: 1. The outer diameter of the side without the tire fixture does not change during the process of installing and removing the tire fixture; 2. The outer diameter of one side of the tire mounting tool is affected by the interference fit, and the outer diameter size changes before and after tire removal, which is the main reason for the taper.

[0020] It has been verified through analysis that the main reason for the taper is due to the interference fit between the jig and the ferrule. However, to ensure that the outer ring of the bearing is non-magnetic and stably assembled on the electromagnetic centerless fixture, the interference fit between the jig and the ferrule is a necessary condition for the processing of the outer ring of the non-magnetic bearing. Therefore, in order to ensure that the outer diameter of the outer ring of the non-magnetic bearing is qualified after the tire is removed, it is imperative to invent a control method for ensuring the outer diameter of the outer ring of the non-magnetic bearing. The specific method used in this embodiment is as follows: The method for processing the outer diameter size of the outer ring of a non-magnetic bearing comprises the following steps: Step 1: Make a magnetic mold, warm-fit the magnetic mold to one side of the inner diameter of the outer ring embryo of the bearing, the magnetic mold is interference-fitted with the inner diameter surface of one side of the outer ring embryo of the bearing, so that the magnetic mold and the outer ring embryo of the bearing are fixed as a whole, and after cooling, measure the parallelism difference of the end face of the ring after installation, and adsorb the magnetic mold on the positioning cylinder of the electromagnetic centerless clamp after passing the inspection; Step 2: Grind the outer diameter of the bearing outer ring embryo so that the outer diameter processing size of the positioning side of the bearing outer ring embryo equipped with the magnetic mold is larger than the outer diameter processing size of the non-positioning side of the bearing outer ring embryo not equipped with the magnetic mold. The difference between the outer diameter and processing size of the positioning side of the bearing outer ring embryo and the outer diameter processing size of the non-positioning side of the bearing outer ring embryo is equal to the assembly interference between the magnetic mold and the bearing outer ring embryo. The outer diameter surface of the bearing outer ring embryo is processed to form a conical surface. The taper is the assembly interference between the magnetic mold and the bearing outer ring embryo, so that the outer diameter processing size of the positioning side of the bearing outer ring embryo is smoothly transitioned to the outer diameter processing size of the non-positioning side of the bearing outer ring embryo; Step three: unloading the tire, separating the magnetic tire mold from the bearing outer ring blank, and the outer diameters of both sides of the bearing outer ring blank can remain consistent after unloading the tire.

[0021] Furthermore, the magnetic mold is a circular ring structure, and a stepped positioning groove is formed on the outer diameter of one side of the magnetic mold. The outer diameter surface of the magnetic mold at the stepped positioning groove is interference fit with the inner diameter surface of one side of the bearing outer ring blank.

[0022] Principle: After the ferrule is assembled, the outer diameter is controlled according to the taper, that is, the outer diameter on one side of the tire assembly is artificially controlled to be different from the outer diameter on the other side, to ensure that the outer diameters on both sides are basically the same after the tire is removed.

[0023] Method for determining outer diameter taper: After the ferrule is assembled, the outer diameter expansion on the side of the tire is equal to the interference; Interference amount = d2-D2, d2 is the outer diameter of the magnetic jig positioning notch, and D2 is the outer diameter of the bearing outer ring blank; The taper is equal to the interference, that is, taper = d2-D2.

[0024] Method for determining the outer diameter of one side of the tire fixture: The outer diameter processing size of the bearing outer ring blank on the side without the tire (the outer diameter processing size of the bearing outer ring blank on the non-positioning side) D is processed according to the standard size, and the outer diameter processing size of the tire side (the outer diameter processing size of the bearing outer ring blank on the positioning side) D1 is controlled according to the taper, taper = D1-D, and the outer diameter D1 on the tire side is calculated according to the formula = D+taper, such as Figure 6 shown.

[0025] For example: Standard requirements for the outer diameter of the ferrule: ∅72 (0~-0.011) mm; Interference: 0.006mm; Taper = interference = 0.006mm; The outer diameter of the side without the tire is processed according to ∅72-0.007mm, so the outer diameter of the side with the tire is equal to ∅72-0.007mm+0.006mm=∅72-0.001mm. After the tire is removed, the outer diameters of both sides are basically ∅72-0.007mm.

[0026] The key point of the present invention is to determine the processing method of the outer diameter taper of the non-magnetic bearing ring with a tire by the interference between the tire and the non-magnetic bearing ring, so as to ensure that the dimensions of the outer diameter of the non-magnetic bearing ring on both sides after the tire is removed are within the qualified range and are basically the same.

[0027] Example 2 The principle of Example 2 is the same as that of Example 1. Since the inner diameter surface of the inner ring blank of the bearing with the mold shrinks, the relevant drawings are omitted. The inner diameter size of the inner ring of the non-magnetic bearing with the mold in this embodiment is controlled, and the processing process is as follows: The method for processing the inner diameter size of the inner ring of a non-magnetic bearing comprises the following steps: Step 1: Make a magnetic mold, warm-fit the magnetic mold to one side of the outer diameter of the inner ring blank of the bearing, the magnetic mold is interference-fitted with the outer diameter surface of one side of the inner ring blank of the bearing, so that the magnetic mold and the inner ring blank of the bearing are fixed as a whole, and after cooling, measure the parallelism difference of the end face of the ring after installation, and adsorb the magnetic mold on the positioning cylinder of the electromagnetic centerless clamp after passing the inspection; Step 2: Grind the inner diameter of the bearing inner ring embryo body so that the inner diameter processing size of the positioning side of the bearing inner ring embryo body equipped with the magnetic mold is smaller than the inner diameter processing size of the non-positioning side of the bearing inner ring embryo body not equipped with the magnetic mold. The difference between the inner diameter processing size of the positioning side of the bearing inner ring embryo body and the inner diameter processing size of the non-positioning side of the bearing inner ring embryo body is equal to the assembly interference between the magnetic mold and the bearing inner ring embryo body. The inner diameter surface of the bearing inner ring embryo body is processed to form a conical surface. The taper is the assembly interference between the magnetic mold and the bearing inner ring embryo body, so that the inner diameter processing size of the positioning side of the bearing inner ring embryo body is smoothly transitioned to the inner diameter processing size of the non-positioning side of the bearing inner ring embryo body. Step 3: Remove the tire and separate the magnetic tire mold from the bearing inner ring blank. After removing the tire, the inner diameters of both sides of the bearing inner ring blank can remain consistent.

[0028] Furthermore, the magnetic mold is a circular ring structure, and a stepped positioning groove is formed on the inner diameter of one side of the magnetic mold. The inner diameter surface of the magnetic mold at the stepped positioning groove is interference fit with the outer diameter surface of one side of the bearing inner ring blank.

[0029] It should be noted that the parts not described in detail in the present invention are prior art.

[0030] The above examples are only the best 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 associated with the contents disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A method for processing the inner and outer diameters of a non-magnetic bearing ring, characterized in that: The following steps are involved: Step 1: Make a magnetic mold, assemble the magnetic mold on one side of the bearing ring embryo, the magnetic mold is interference fit with the inner diameter surface or outer diameter surface of the bearing ring embryo, so that the magnetic mold and the bearing ring embryo are fixed as a whole, and the magnetic mold is adsorbed on the positioning cylinder of the electromagnetic centerless clamp; Step 2: Processing the bearing ring embryo body so that the processing size of the positioning side of the bearing ring embryo body equipped with the magnetic mold is not equal to the processing size of the non-positioning side of the bearing ring embryo body not equipped with the magnetic mold, and the processing size of the positioning side of the bearing ring embryo body smoothly transitions to the processing size of the non-positioning side of the bearing ring embryo body; Step 3: Remove the tire and separate the magnetic tire mold from the bearing ring blank.

2. The method for processing the inner diameter and outer diameter of a non-magnetic bearing ring according to claim 1, characterized in that: The magnetic mold is a circular ring structure, and a stepped positioning groove is formed on one side positioning surface of the magnetic mold. The magnetic mold is interference fit with the inner diameter surface or outer diameter surface of one side of the bearing ring blank through the stepped positioning groove.

3. The method for processing the inner diameter and outer diameter of a non-magnetic bearing ring according to claim 1, characterized in that: In step one, the magnetic mold and the bearing ring blank are installed warm, and after cooling, the parallelism difference of the ring end faces after installation is measured. After passing the inspection, the magnetic mold is adsorbed on the positioning cylinder of the electromagnetic centerless fixture.

4. The method for processing the inner diameter and outer diameter of a non-magnetic bearing ring according to claim 1, characterized in that: In step 2, when processing the bearing ring blank, the difference between the processing size of the positioning side of the bearing ring blank and the processing size of the non-positioning side of the bearing ring blank is equal to the assembly interference between the magnetic mold and the bearing ring blank.

5. The method for processing the inner diameter and outer diameter of a non-magnetic bearing ring according to claim 1, characterized in that: In step 2, the surface formed by machining the bearing ring blank is a conical surface, and the taper of the conical surface is equal to the assembly interference between the magnetic mold and the bearing ring blank.

6. The method for processing the inner diameter and outer diameter of a non-magnetic bearing ring according to any one of claims 1 to 5, characterized in that: In step three, the dimensions of both sides of the bearing ring blank after tire removal should remain consistent.

7. The method for processing the inner diameter and outer diameter of a non-magnetic bearing ring according to any one of claims 1 to 5, characterized in that: When machining the outer diameter of the outer ring of a non-magnetic bearing, the following steps are included: Step 1, make a magnetic mold, warm-fit the magnetic mold to one side of the inner diameter of the outer ring embryo of the bearing, the magnetic mold and the inner diameter surface of one side of the outer ring embryo of the bearing are interference-fitted, so that the magnetic mold and the outer ring embryo of the bearing are fixed as a whole, and after cooling, measure the parallelism difference of the end face of the ring after installation, and adsorb the magnetic mold on the positioning cylinder of the electromagnetic centerless clamp after passing the inspection; the magnetic mold is a circular ring structure, and a stepped positioning notch is formed on the outer diameter of one side of the magnetic mold. The outer diameter surface of the magnetic mold at the stepped positioning notch is interference-fitted with the inner diameter surface of one side of the outer ring embryo of the bearing; Step 2: Grind the outer diameter of the bearing outer ring embryo so that the outer diameter processing size of the positioning side of the bearing outer ring embryo equipped with the magnetic mold is larger than the outer diameter processing size of the non-positioning side of the bearing outer ring embryo not equipped with the magnetic mold. The difference between the outer diameter and processing size of the positioning side of the bearing outer ring embryo and the outer diameter processing size of the non-positioning side of the bearing outer ring embryo is equal to the assembly interference between the magnetic mold and the bearing outer ring embryo. The outer diameter surface of the bearing outer ring embryo is processed to form a conical surface. The taper is the assembly interference between the magnetic mold and the bearing outer ring embryo, so that the outer diameter processing size of the positioning side of the bearing outer ring embryo is smoothly transitioned to the outer diameter processing size of the non-positioning side of the bearing outer ring embryo; Step three: unloading the tire, separating the magnetic tire mold from the bearing outer ring blank, and the outer diameters of both sides of the bearing outer ring blank can remain consistent after unloading the tire.

8. The method for processing the inner diameter and outer diameter of a non-magnetic bearing ring according to any one of claims 1 to 5, characterized in that: When machining the inner diameter of the inner ring of a non-magnetic bearing, the following steps are included: Step 1, make a magnetic mold, warm-fit the magnetic mold to one side of the outer diameter of the inner ring blank of the bearing, the magnetic mold and the outer diameter surface of one side of the inner ring blank of the bearing are interference-fitted, so that the magnetic mold and the inner ring blank of the bearing are fixed as a whole, and after cooling, measure the parallelism difference of the end face of the ring after installation, and adsorb the magnetic mold on the positioning cylinder of the electromagnetic centerless clamp after passing the inspection; the magnetic mold is a circular ring structure, and a stepped positioning notch is formed on the inner diameter of one side of the magnetic mold. The magnetic mold is interference-fitted with the outer diameter surface of one side of the inner ring blank of the bearing through the inner diameter surface at the stepped positioning notch; Step 2: Grind the inner diameter of the bearing inner ring embryo body so that the inner diameter processing size of the positioning side of the bearing inner ring embryo body equipped with the magnetic mold is smaller than the inner diameter processing size of the non-positioning side of the bearing inner ring embryo body not equipped with the magnetic mold. The difference between the inner diameter processing size of the positioning side of the bearing inner ring embryo body and the inner diameter processing size of the non-positioning side of the bearing inner ring embryo body is equal to the assembly interference between the magnetic mold and the bearing inner ring embryo body. The inner diameter surface of the bearing inner ring embryo body is processed to form a conical surface. The taper is the assembly interference between the magnetic mold and the bearing inner ring embryo body, so that the inner diameter processing size of the positioning side of the bearing inner ring embryo body is smoothly transitioned to the inner diameter processing size of the non-positioning side of the bearing inner ring embryo body. Step 3: Remove the tire and separate the magnetic tire mold from the bearing inner ring blank. After removing the tire, the inner diameters of both sides of the bearing inner ring blank can remain consistent.

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