A bearing steel ball grinding method suitable for various materials

Abstract

The application provides a bearing steel ball grinding method suitable for various materials, which comprises the following steps: step S1, preparing grinding material A; step S2, preparing grinding material B; step S3, using common grinding material to process the steel ball until the remaining allowance is 0.01-0.03 mm to the steel ball finished product size tolerance, then replacing the grinding material A to grind the steel ball until the upper limit of the steel ball finished product size tolerance; step S4, according to the smoothness requirement of the steel ball, using kerosene to remove 70%-80% of the grinding material A in the grinding disc, then adding the grinding material B into the grinding disc for 1-5 times, and simultaneously grinding the steel ball with the remaining grinding material A; and step S5, grinding until the steel ball reaches the tolerance range. The combined use of the grinding material A and the grinding material B is suitable for the grinding of the bearing steel ball with various materials and hardness, has no corrosivity to the steel ball product, can provide a relatively unified operation process for the steel ball grinding process, can improve the grinding precision and appearance quality of the steel ball, and improves the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to bearing manufacturing technology, in particular to bearing steel ball manufacturing technology, and more particularly to a bearing steel ball grinding method suitable for various materials. BACKGROUND

[0002] With the improvement of the industry's requirements for bearing use, the steel ball material is also updated, and the use precision grade is also improved. In the grinding process of bearing steel balls, the grinding material is the key factor affecting the precision of the steel ball. In the prior art, different grinding material ratios and use methods are used for bearing steel balls of different materials and hardnesses, which causes different batches of steel ball products to usually need to re-determine the grinding material ratio and use method. There is no universal grinding method, which causes the grinding process to be complicated, the precision to be difficult to control, and the production efficiency to be low. SUMMARY

[0003] In view of the problems pointed out in the background art, the purpose of the present application is to provide a bearing steel ball grinding method suitable for various materials, which is suitable for the grinding process of bearing steel balls of various materials and hardnesses. Through the method, a relatively unified operation process can be provided for the steel ball grinding process, and the grinding efficiency can be improved.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] A bearing steel ball grinding method suitable for various materials, comprising the following steps:

[0006] Step S1, preparing a grinding material A, and the preparation method of the grinding material A is as follows:

[0007] Step S1.1, taking 30%±2% by mass of 2000 mesh chromium oxide powder, 70%±5% by mass of flaky or powdery stearic acid, and stirring and mixing uniformly to prepare a mixed powder;

[0008] Step S1.2, adding the mixed powder into kerosene according to a mass ratio of 1:1, stirring uniformly to prepare a mixed liquid, and then adding 20# machine oil with a mass of 50%±10% of the mixed liquid, and mixing and stirring to prepare a paste-shaped fluid with appropriate concentration;

[0009] Step S1.3, after adding 2kg-5kg SФ12.7mm bright hard balls into the paste-shaped fluid, pouring into a barrel and tumbling for 30-40 hours;

[0010] Step S1.4, taking out the bright hard balls, adding kerosene into the paste-shaped fluid according to a mass ratio of 1:1, adding 20# machine oil with the same mass as the kerosene of this step, stirring uniformly, and then filtering using 160 mesh-280 mesh gauze. The obtained liquid is the grinding material A;

[0011] Step S2, preparing the abrasive B, the paste W0.25 artificial diamond micro-powder abrasive is added into kerosene by 1:20 mass, and the mixed solution obtained after stirring uniformly is the abrasive B;

[0012] Step S3, using the common abrasive to process the steel ball, when the remaining allowance is 0.01-0.03mm to the steel ball finished product size tolerance, the abrasive A is used to process the steel ball, and the upper limit of the steel ball finished product size tolerance is reached;

[0013] Step S4, according to the smoothness requirement of the steel ball, the abrasive A in the grinding disc is removed by 70%-80% using kerosene, and then the abrasive B is added into the grinding disc by 1-5 times, and the steel ball is processed by the remaining abrasive A and the abrasive B at the same time;

[0014] Step S5, the steel ball is processed to reach the tolerance range.

[0015] In the step S1, the purity grade of the chromium oxide powder is the analytical pure grade.

[0016] In the step S1, the bright hard ball is SФ12.7mm, and the material is steel GCr15, and the hardness is greater than or equal to 58HRC.

[0017] The beneficial effects of the present application are that the combination of the abrasive A and the abrasive B is suitable for the grinding processing of the bearing steel ball of various materials and hardness, has no corrosion to the steel ball product, can provide a relatively unified operation process for the steel ball grinding process, can improve the grinding precision and appearance quality of the steel ball, and can improve the production efficiency. Embodiment

[0018] The technical solutions of the present application will be described clearly and completely in combination with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0019] The present application provides a bearing steel ball grinding method suitable for various materials, and the technical solutions are described in the content of the claims, and will not be repeated. The principle of the present application is described as follows:

[0020] The abrasive A is suitable for grinding and processing steel balls of various precision grades of common bearing steel, stainless steel and the like, such as GCr15, ZGCr15-military armor, GCr15SiMn, 9Cr18 and the like when used alone; the abrasive B is a commonly used abrasive material, mainly used in the grinding and polishing of optical glass, fine ceramic, gem and the like, and the production of diamond abrasive paste and polishing agent, and there is no difference from the prior art; the abrasive B is not commonly used as an abrasive material for bearing steel ball grinding, mainly because of its low grinding efficiency and high value, and it is almost impossible to grind away the size when used alone, and the grinding efficiency is very low; the abrasive B is used as an additive and cooperated with the abrasive A, and the abrasive A and the abrasive B cooperated with each other are suitable for grinding and processing steel balls of various precision grades of common bearing steel, stainless steel, high-temperature heat-resistant steel and the like, such as Cr4Mo4V, 8Cr4Mo4V and the like, and the grinding method has a wider application range and better grinding effect.

[0021] Example 1

[0022] The material is steel GCr15-military armor, the size of G16 grade steel ball is Φ15.875 (5 / 8in) mm, a total of 2000, a pair of grinding discs are needed for processing, and about 7000g of abrasive A and 1000g of abrasive B are needed for fine grinding, and the preparation process steps are as follows:

[0023] S1, first prepare the abrasive A;

[0024] S1.1, take 300g of 2000 mesh analytical pure cadmium oxide powder, add 700g of powdered stearic acid, and stir uniformly;

[0025] S1.2, add the mixed powder into 1000g of kerosene and 1000g of 20# machine oil, mix and stir uniformly to prepare a paste-like fluid;

[0026] S1.3, add 2kg of SΦ12.7mm size bright hard ball into the paste-like fluid, and pour into a barrel for 30 hours;

[0027] S1.4, take out the bright hard ball, add 3000g of kerosene and 1000g of 20# machine oil into the paste-like fluid, mix and stir uniformly, then filter with 200 mesh gauze, and complete the preparation of the abrasive A after transition;

[0028] S2, prepare the abrasive B, take 50g of paste-like W0.25 artificial diamond micro-powder abrasive, add 1000g of kerosene, and stir uniformly to complete the preparation of the abrasive B;

[0029] S3, processing process: the steel ball is processed to a size of 15.875-15.875mm by using common abrasive; SΦ15.875±0.01mm, then clean the ordinary abrasive, replace the abrasive A to grind the steel ball, adjust the grinding disc speed 35r / min, pressure 25KN, size process to

[0030] S4, use kerosene to clean about 70% of the abrasive A in the grinding disc, adjust the grinding disc speed 20r / min, pressure 15KN, add the abrasive B to the grinding disc in 1-2 times, grind the steel ball with the abrasive A at the same time;

[0031] S5, grind the steel ball to the finished product tolerance range SΦ15.875±0.01mm.

[0032] After detection, in example 1, the diameter variation of the steel ball is 0.2-0.3um, the diameter variation of the ball batch is 0.4-0.6um, the spherical error is 0.2-0.3um, the surface roughness is 0.015-0.026um, the appearance is visually inspected using a shadow lamp and a 100x magnifying lens, and the appearance and precision meet the standard requirements.

[0033] Example 2:

[0034] Material steel 8Cr4Mo4V, size Φ17.4625(11 / 16in)mm G5 grade steel ball, a total of 3000 particles, 1 pair of grinding discs are needed for processing, and about 7000g of abrasive A and 1000g of abrasive B are needed for lapping, the preparation process steps are as follows:

[0035] S1, first prepare the abrasive A

[0036] S1.1, take 300g of 2000 mesh analytical grade cadmium oxide powder, add 700g of powdered stearic acid, and stir evenly;

[0037] S1.2, add the mixed powder to 1000g of kerosene and 1000g of 20# machine oil, mix and stir evenly to make a paste-like fluid;

[0038] S1.3, add 2kg of SΦ12.7mm size bright hard ball to the paste-like fluid, and pour into a barrel for 40 hours;

[0039] S1.4, take out the bright hard ball, add 3000g of kerosene and 1000g of 20# machine oil to the paste-like fluid, mix and stir evenly, then filter with 200 mesh gauze, and complete the preparation of the abrasive A after transition;

[0040] S2, prepare the abrasive B, take 50g of paste-like W0.25 artificial diamond micro-powder abrasive, add 1000g of kerosene, and stir evenly to complete the preparation of the abrasive B;

[0041] S3, process: use ordinary abrasive to process the steel ball to a size in When the diameter of the steel ball is within the range, clean the common abrasive, replace the abrasive A, and grind the steel ball, adjust the rotation speed of the grinding disc to 30 r / min, the pressure to 25 KN, and process the size to

[0042] S4, clean about 80% of the abrasive A in the grinding disc with kerosene, adjust the rotation speed of the grinding disc to 10 r / min, the pressure to 10 KN, add the abrasive B into the grinding disc in 2-5 times, and grind the steel ball with the abrasive A at the same time;

[0043] S5, grind the steel ball to the finished product tolerance range SΦ17.4625±0.005 mm.

[0044] Through detection, in the example 2, the diameter variation of the steel ball is 0.08-0.10 um, the diameter variation of the ball batch is 0.1-0.2 um, the spherical error is 0.08-0.10 um, the surface roughness is 0.009-0.012 um, the appearance is visually inspected by using the shadowless lamp and the 100 times magnifying glass, and the appearance and the precision all meet the standard requirements.

[0045] The part not described in the application is the prior art.

Claims

1. A method for grinding bearing steel balls of various materials, characterized in that: It comprises the following steps: Step S1, preparing abrasive A, the preparation method of which is as follows: Step S1.1, taking 30%±2% mass of 2000 mesh chromium oxide powder, 70%±5% mass of flaky or powdered stearic acid, stirring and mixing uniformly to make a mixed powder; Step S1.2, adding the mixed powder into kerosene according to a mass ratio of 1:1, stirring uniformly to make a mixed liquid, then adding 50%±10% of the mass of the mixed liquid of 20# machine oil, mixing and stirring to make a paste-shaped fluid with appropriate concentration; Step S1.3, after adding 2kg-5kg of SФ12.7mm bright hard balls into the paste-shaped fluid, pouring into a barrel and tumbling for 30-40 hours; Step S1.4, taking out the bright hard balls, adding kerosene into the paste-shaped fluid according to a mass ratio of 1:1, then adding 20# machine oil with the same mass as the kerosene of this step, stirring uniformly, then filtering using 160-280 mesh gauze, and the obtained liquid is abrasive A; Step S2, preparing abrasive B, adding paste-shaped W0.25 artificial diamond micro-powder abrasive into kerosene according to a mass ratio of 1:20, stirring uniformly to obtain a mixed liquid, which is abrasive B; Step S3, using common abrasive to process steel balls, when the remaining allowance is 0.01-0.03mm to reach the size tolerance of the finished steel balls, replacing abrasive A to process the steel balls, until the upper limit of the size tolerance range of the finished steel balls is reached; Step S4, according to the smoothness requirement of the steel balls, using kerosene to remove 70%-80% of the abrasive A in the grinding disc, then adding abrasive B into the grinding disc in 1-5 times, and simultaneously processing the steel balls with the remaining abrasive A; Step S5, processing until the steel balls reach the tolerance range.

2. The method of claim 1, wherein the method is suitable for grinding balls of various materials. In the step S1, the purity grade of the chromium oxide powder is analytical pure grade.

3. The bearing steel ball grinding method suitable for multiple materials according to claim 1, characterized in that: In the step S1, the bright hard ball is SФ12.7mm, and the material is steel GCr15 with a hardness of ≥58HRC.