Bearing steel ball machining process

Abstract

The invention discloses a bearing steel ball machining process, which relates to the technical field of steel ball machining, and comprises the following steps of: turning a groove on a resin grinding wheel of a horizontal ball lapping machine, and processing by using a soft ball groove pressing process; the basic grinding fluid and a hydrocarbon cleaning agent are mixed to serve as grinding fluid, and the grinding fluid is circularly introduced into a ball grinding machine; during ball feeding, the pressure of a machine table is controlled to be 1.4-1.6 MPa, the rotating speed of a main shaft is 9-11 r / min, and operation is conducted for 10 min to preliminarily correct a ball body; increasing the speed and the pressure to a preset value, and entering a rapid cutting stage; reducing the pressure to 2.4-2.6 MPa and the speed of a main shaft to 19-21 r / min when the required size is approached, and performing precision correction; and when the required size is reached, shutting down and discharging the ball. According to the bearing steel ball machining technology, the geometrical parameter values of the machined steel balls are small in discreteness and high in precision, the dynamic performance of the steel balls is effectively improved, the fitting abnormal noise of final products is reduced, and the service life of the final products is prolonged; meanwhile, the cost is reduced, and the environmental pollution is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steel ball processing, in particular to a bearing steel ball processing technology. Background Art

[0002] In the past, the domestic final processing technology of steel balls mainly used cast iron discs with added abrasives for grinding. However, due to the influence of factors such as the quality of the cast iron discs, uneven addition of abrasives, and difficulty in keeping the abrasives clean, the surface quality of the steel balls was unstable, especially the vibration value of the steel balls was difficult to reduce.

[0003] In addition, the use of grinding fluid is crucial in the processing process, as it plays a role in cooling, lubricating and cleaning. However, the current use cycle of grinding fluid is short, and frequent replacement is not only time-consuming and labor-intensive, increasing labor costs, but also leads to waste of raw materials, which in turn pushes up production input costs. At the same time, during the process of replacing the grinding fluid, the machine area is easily contaminated, and the slippery ground is difficult to clean, increasing the risk of slips and work-related accidents. In addition, the turnover treatment of waste fluid is also prone to environmental pollution. These unfavorable factors accumulate with each other, ultimately leading to a sharp increase in production costs and a serious waste of resources, and are in urgent need of optimization and improvement.

[0004] Therefore, it is necessary to propose a bearing steel ball processing technology to solve the above problems. Summary of the invention

[0005] 1. Technical issues to be resolved The purpose of the present invention is to provide a bearing steel ball processing technology to solve the problems raised in the above background technology.

[0006] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: a bearing steel ball processing process, comprising the following steps: S1. Turn the grooves on the upper and lower resin grinding wheels of the horizontal steel ball grinding machine, and use the soft ball groove pressing process to press and grind the grooves; S2, mixing and diluting the basic grinding fluid and the hydrocarbon cleaning agent as the grinding fluid, and circulating the mixture into the horizontal steel ball grinding machine; S3. When the horizontal steel ball grinding machine is grinding balls, the machine pressure F is controlled at 1.4-1.6MPa, the spindle speed S is controlled at 9-11r / min, and it runs for 10 minutes to eliminate the abnormal phenomenon that the large balls mixed in the equipment cause damage, and make preliminary corrections to the balls; S4, after correction, the speed and pressure are increased to the preset value to enter the normal rapid cutting stage; S5. When the measured ball size is close to the required processing value, the machine pressure F is reduced to 2.4-2.6MPa, the spindle speed is reduced to 19-21r / min, and the batch diameter variation, ball diameter variation, spherical error, and surface roughness are corrected; S6. When the measured processing size reaches the required size, stop the machine and remove the ball.

[0007] Preferably, the ratio of the basic grinding fluid, hydrocarbon cleaning agent and dilution solvent is 5:2:20-25.

[0008] Preferably, the preset value described in step 4 is set according to the ball gauge value and the machine performance, the maximum machine pressure F≤4Mpa, and the maximum spindle speed S≤40r / min.

[0009] Preferably, the method further comprises the following steps: cleaning the iron powder and grinding wheel dust in the grinding fluid by means of a magnetic separator.

[0010] Preferably, the resin grinding wheel is a phenolic resin grinding wheel.

[0011] (III) Beneficial effects Compared with the prior art, the present invention provides a bearing steel ball processing technology, which has the following beneficial effects: The bearing steel ball processing technology has small discreteness and high precision of the geometric parameter values ​​of the steel balls after processing, which effectively improves the dynamic performance of the steel balls, reduces the abnormal noise during assembly of the final product, and extends the service life of the final product; in terms of processing cost, while effectively improving the processing efficiency, it reduces the frequency of grinding fluid replacement and replenishment, extends the service life of the grinding fluid, reduces environmental pollution on the machine floor, greatly reduces the waste of grinding fluid caused by filling, replacement and insufficient proportioning, and reduces the investment in processing costs; regularly uses a magnetic separator to clean up iron powder and grinding wheel dust in the grinding precipitation solution, which greatly improves the utilization rate of the grinding fluid, reduces material waste, reduces cost expenditure, and eliminates a series of environmental pollution phenomena caused by replacing and circulating waste grinding fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the machine pressure F and the spindle speed S of the horizontal steel ball grinding machine of the present invention. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0014] Embodiment 1: See also Figure 1 As shown, a bearing steel ball processing process includes the following steps: Grooves are turned on the upper and lower resin grinding wheels of a horizontal steel ball grinding machine to improve the grinding accuracy of the grooves, and then the grooves are pressed and ground using a soft ball pressing process to improve the grinding accuracy; the horizontal steel ball grinding machine used is a horizontal steel ball grinding machine model 3M7790.

[0015] The base grinding fluid and hydrocarbon cleaning agent are mixed and diluted as the grinding fluid, and circulated into the horizontal steel ball grinding machine.

[0016] When the horizontal steel ball grinding machine is grinding balls, the machine pressure F is controlled at 1.5MPa, the spindle speed S is controlled at 10r / min, and it runs for 10min to eliminate the abnormal phenomenon that large balls mixed in may cause damage to the equipment, and at the same time, the ball is corrected appropriately.

[0017] According to the processing ball gauge value and machine performance, the speed and pressure are increased to the appropriate pressure F and spindle speed S to enter the normal rapid cutting stage; among them, the maximum machine pressure F≤4Mpa, and the maximum spindle speed S≤40r / min, to avoid excessive pressure, which will cause the spindle drive wheel and belt to slip, resulting in local surface grinding of the ball, affecting the processing roundness, surface quality and other index parameters.

[0018] When the measured ball size is close to the required processing value, the pressure and speed are reduced to correct the ball parameters. The machine pressure F is reduced to 2.5MPa, the spindle speed is reduced to 20r / min, and the batch diameter variation V is measured. DWL , ball diameter variation V DWS , spherical error △R SW , correction of geometric parameters such as surface roughness Ra; Finally, when the measured processing size reaches the required size, the machine is stopped and the ball is removed.

[0019] Embodiment 2: The difference from implementation one is that when the horizontal steel ball grinding machine grinds balls, the machine pressure F is controlled at 1.4MPa, the spindle speed S is controlled at 9r / min, and it runs for 10min to eliminate the abnormal phenomenon that large balls mixed in may damage the equipment, and at the same time, the ball is corrected appropriately.

[0020] When the measured ball size is close to the required processing value, the pressure and speed are reduced to correct the ball parameters. The machine pressure F is reduced to 2.4MPa, the spindle speed is reduced to 19r / min, and the batch diameter change V is measured. DWL , ball diameter variation V DWS , spherical error △R SW , correction of geometric parameters such as surface roughness Ra, etc.

[0021] Embodiment three: The difference from implementation one is that when the horizontal steel ball grinding machine grinds balls, the machine pressure F is controlled at 1.6MPa, the spindle speed S is controlled at 11r / min, and it runs for 10min to eliminate the abnormal phenomenon that large balls mixed in may damage the equipment, and at the same time, the ball is corrected appropriately.

[0022] When the measured ball size is close to the required processing value, the pressure and speed are reduced to correct the ball parameters. The machine pressure F is reduced to 2.6MPa, the spindle speed is reduced to 21r / min, and the batch diameter variation V is measured. DWL , ball diameter variation V DWS , spherical error △R SW , correction of geometric parameters such as surface roughness Ra, etc.

[0023] In some embodiments, the ratio of the base grinding fluid, hydrocarbon cleaning agent and dilution solvent is 5:2:20-25, the base grinding fluid is NW-05 resin grinding wheel grinding fluid, and the dilution solvent is water.

[0024] In order to prevent iron powder and grinding wheel dust from contaminating the grinding fluid and affecting the surface quality of the product, the iron powder and grinding wheel dust in the grinding fluid must be cleaned regularly through a magnetic separator. This will increase the replacement cycle of the grinding fluid and reduce costs.

[0025] Among them, the phenolic resin grinding wheel is made by evenly mixing ultrafine abrasive powder with phenolic resin modified binder, and then pressing and hardening it. It has the performance of high temperature resistance, high hardness, sharp grinding, uniform particle size distribution without large particles, and is not easy to scratch the surface of the steel ball.

[0026] The above-mentioned research on the advantages of grinding fluid over the original basic grinding fluid, we took the φ22.225 steel ball as an example, and conducted experimental statistics and comparisons in terms of monthly initial research capacity and costs, as follows: The grinding fluid has a smaller discrete deviation in the quality of the steel ball than the original basic grinding fluid, and the ball diameter variation V DWS , Batch diameter variation V DWL and spherical error △R SW The geometric parameters are small and accurate, the surface quality is smoother, the roughness Ra is low, the grinding lines are uniform, shallow and short, which fully meets the requirements of eddy current flaw detection process for the cleanliness and brightness of the steel ball surface.

[0027] From the analysis of the above data, it can be found that the monthly output of a single device is 43% higher than that of the basic grinding fluid with the same dilution concentration, and the average monthly cost is reduced from 345 yuan / ton to 189 yuan / ton, a decrease of 45%, which effectively reduces the investment in production costs.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bearing steel ball processing process, characterized in that: The following steps are involved: S1. Turn the grooves on the upper and lower resin grinding wheels of the horizontal steel ball grinding machine, and use the soft ball groove pressing process to press and grind the grooves; S2, mixing and diluting the basic grinding fluid and the hydrocarbon cleaning agent as the grinding fluid, and circulating the mixture into the horizontal steel ball grinding machine; S3. When the horizontal steel ball grinding machine is grinding balls, the machine pressure F is controlled at 1.4-1.6MPa, the spindle speed S is controlled at 9-11r / min, and it runs for 10 minutes to eliminate the abnormal phenomenon that the large balls mixed in the equipment cause damage, and make preliminary corrections to the balls; S4, after correction, the speed and pressure are increased to the preset value to enter the normal rapid cutting stage; S5. When the measured ball size is close to the required processing value, the machine pressure F is reduced to 2.4-2.6MPa, the spindle speed is reduced to 19-21r / min, and the batch diameter variation, ball diameter variation, spherical error, and surface roughness are corrected; S6. When the measured processing size reaches the required size, stop the machine and remove the ball.

2. A bearing steel ball processing process according to claim 1, characterized in that: The ratio of the basic grinding fluid, hydrocarbon cleaning agent and dilution solvent is 5:2:20-25.

3. The process for processing a bearing steel ball according to claim 1, characterized in that: The preset values ​​described in step 4 are set according to the ball gauge value and the machine performance, the maximum machine pressure F≤4Mpa, and the maximum spindle speed S≤40r / min.

4. The process for processing a bearing steel ball according to claim 1, characterized in that: The following steps are also included: The iron powder and grinding wheel dust in the grinding fluid are cleaned by a magnetic separator.

5. The process for processing a bearing steel ball according to claim 1, characterized in that: The resin grinding wheel is a phenolic resin grinding wheel.

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