JP2014109371A - Ball bearing with aligning ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball bearing with an aligning ring, which is arranged in water solution including boric acid and potassium iodide to improve both corrosion resistance and wear resistance.SOLUTION: A ball bearing 8 with an aligning ring is arranged in water solution including boric acid and potassium iodide. An outer ring 10 and an inner ring 11 of the ball bearing 8 with the aligning ring is each formed of stainless steel which contains 0.28 wt% or higher and 0.33 wt% or lower carbon and 0.35 wt% or higher and 0.40 wt% or lower nitrogen. The outer ring 10 and the inner ring 11 are each subjected to quenching and tempering.

Description

  The present invention relates to a ball bearing with an aligning ring, and more particularly to a ball bearing with an aligning ring that is preferably used in a state where it is submerged in a corrosive solution.

  Conventionally, as a rolling bearing used in a corrosive environment, there is one described in Japanese Patent Laid-Open No. 2001-271842 (Patent Document 1). This rolling bearing employs a material having excellent corrosion resistance such as SUS630 as the material of the raceway ring, so that the rolling bearing is not easily deteriorated even when used in high temperature and high pressure water.

  However, when a bearing having a bearing ring made of SUS630 is used in a corrosive aqueous solution and an environment where a moment load is applied, for example, in a chemical solution such as a liquid crystal deflection film manufacturing apparatus, there is no lubricant. Since bearings are used in environments that are susceptible to corrosion and in environments where a large moment load is applied, the degree of wear of the bearings becomes severe, and the bearing life becomes, for example, about one month. It becomes very short.

  However, SUS630 is a steel material that is excellent in corrosion resistance but does not cause martensitic transformation and cannot be quenched and tempered. There is a problem that sex cannot be increased.

  On the other hand, if a martensitic SUS440C having a high hardness is used as the material of the raceway to solve the above problem, the hardness (HRC) becomes about 60 and the necessary hardness can be obtained. There is a problem that a high corrosion resistance cannot be obtained.

JP 2001-271842 A

  Accordingly, an object of the present invention is to provide a ball bearing with an aligning ring that is disposed in an aqueous solution containing boric acid and potassium iodide and that can improve both corrosion resistance and wear resistance. .

In order to solve the above problems, a ball bearing with a centering ring of the present invention is
An inner ring having a raceway groove;
While having a raceway groove on the inner peripheral side, an outer ring having a centering surface for aligning on the outer peripheral side,
A ceramic ball disposed between the inner ring raceway groove and the outer ring raceway groove;
The outer ring is arranged on the outer side in the radial direction of the outer ring, and includes a aligning ring having an alignment surface on the inner peripheral side for aligning,
It is arranged in an aqueous solution containing boric acid and potassium iodide,
Each of the outer ring and the inner ring is made of stainless steel containing 0.28 wt% or more and 0.33 wt% or less of carbon and 0.35 wt% or more and 0.40 wt% or less of nitrogen.
Each of the outer ring and the inner ring is subjected to quenching and tempering.

  In the present invention, stainless steel is defined as an alloy steel containing chromium and nickel.

  In the present invention, it is assumed that 0.35 wt% or more and 0.40 wt% or less of nitrogen is present uniformly and uniformly in each of the outer ring and the inner ring regardless of the location. Accordingly, the nitrogen density in the surface layer part and the nitrogen density inside the surface part other than the surface layer part, such as impregnation in which N is soaked into the surface part later or surface nitriding, are not within the scope of the present invention. Suppose that Since the present invention is used in an environment where the wear and corrosion are severe, even if the wear and corrosion progresses to the mm unit instead of the μm unit, if it cannot be used, it cannot be a practical product.

  According to the present invention, on the outer side in the radial direction of the outer ring, since it has a centering ring having a centering surface for aligning on the inner peripheral side, an apparatus for manufacturing a deflection film constituting liquid crystal, etc. Even when used in an environment where a large moment load acts, the centering function can absorb the moment load. Therefore, the wear resistance can be improved, and in particular, the wear resistance when used in an environment where a large moment load acts, such as an apparatus for producing a long deflection film, can be increased.

  Further, according to the present invention, since each of the outer ring and the inner ring contains 0.28% by weight or more of carbon, martensitic transformation can be caused in the structure of the outer ring and the inner ring without any problem by quenching, and the hardness Can be increased. Further, toughness can be obtained by subsequent tempering. Therefore, wear resistance can be improved. The present inventor has confirmed that if carbon is smaller than 0.28% by weight, even if quenched, martensitic transformation does not occur sufficiently, and it becomes difficult to obtain a problem-free hardness. It is.

  In addition, according to the present invention, since 0.35% by weight or more of nitrogen is present, the hardness can be further increased and the wear resistance can be increased. According to the present invention, since 0.35% by weight or more of nitrogen is added to 0.28% by weight or more of carbon, it is possible to realize a hardness comparable to that of martensitic SUS440C. Thus, the wear resistance can be improved.

  Further, according to the present invention, since carbon is 0.32% by weight or less, it is possible to suppress the bonding of carbon with chromium, and it is possible to suppress the decrease in corrosion resistance of chromium, and there is no problem with corrosion resistance. realizable.

  In order to obtain a sufficient hardness only with carbon, a hardness close to the maximum value can be obtained by adding about 0.60% by weight of carbon. However, the present inventor has found that if carbon is present in an amount of more than 0.32% by weight, the bonding between carbon and chromium is promoted to produce chromium carbide, and the corrosion resistance of chromium is lost. It was. Therefore, the upper limit of carbon is set so that the corrosion resistance is not lost, and in order to compensate for the insufficient hardness, 0.35 wt% or more of nitrogen that has obtained sufficient hardness in the test is contained.

  Further, according to the present invention, nitrogen blowholes are not frequently generated because nitrogen is 0.40% by weight or less. Nitrogen is an intrusion-type solid solution element, has an extremely high solid solution strengthening ability, is an austenite phase stabilization element, and is a basic component of the present invention that is effective in improving corrosion resistance. Here, it was found that when the amount of nitrogen was less than 0.15% by weight, a δ ferrite phase was formed, leading to a decrease in strength. However, if it exceeds 0.40% by weight, it is confirmed that nitrogen blowholes are frequently generated, and in order to suppress the formation of nitrogen blowholes, a melting facility stored in a high-pressure environment of 10 atm or more is required. Become. Therefore, the manufacturing cost is increased. Moreover, when the weight% of nitrogen exceeds 0.40 weight%, the effect of promoting segregation of components during solidification has been confirmed, which is not preferable.

In one embodiment,
The radial internal clearance is equal to or greater than the minimum radial internal clearance of the deep groove ball bearing defined in Japanese Industrial Standard C4 as of the end of November 2005.

  The present inventor determined the initial radial internal clearance of the ball bearing with the aligning ring of the present invention as the minimum radial internal clearance of the deep groove ball bearing defined in Japanese Industrial Standard C4 as of the end of November 2005. It has been confirmed that the ball bearings with the aligning ring according to the present invention can move more smoothly and can reduce the rattling of the ball bearing with the aligning ring when set as described above.

  The present inventor believes that if the radial internal clearance is equal to or greater than the minimum value of C4 of the Japanese Industrial Standard (JIS), the wear powder generated in the bearing flows out smoothly into the solution, and the bearing This is presumed to be difficult to bite.

  According to the above embodiment, the radial internal clearance is equal to or greater than the minimum radial internal clearance value of the deep groove ball bearing defined in Japanese Industrial Standard C4 as of the end of November 2005. The bearing life can be further increased.

  ADVANTAGE OF THE INVENTION According to this invention, while being arrange | positioned in the aqueous solution containing a boric acid and potassium iodide, the ball bearing with the aligning ring which can improve both corrosion resistance and abrasion resistance is realizable.

It is a schematic diagram of the liquid crystal film manufacturing apparatus which colors the deflection film of the liquid crystal by which the ball bearing with the aligning ring of one Embodiment of this invention is arrange | positioned. It is a schematic cross section which shows the one end part of the extending direction of the roll of the said liquid-crystal film manufacturing apparatus. It is a schematic cross section of the axial direction of the ball bearing with a centering ring which supports the said roll rotatably. It is one test figure which shows the value of the radial clearance increased in each case, when the ball bearing with a centering ring of this invention and the conventional ball bearing with a centering ring are used for a fixed time in a chemical | medical solution.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic view of a liquid crystal film manufacturing apparatus (hereinafter simply referred to as a manufacturing apparatus) for coloring a liquid crystal deflection film in which a ball bearing with a centering ring according to an embodiment of the present invention is disposed.

  This liquid crystal film manufacturing apparatus includes a bathtub 1 and a plurality of rolls 2, and the bathtub 1 is filled with a chemical solution. The chemical solution is composed of an aqueous solution containing boric acid and potassium iodide. In this manufacturing apparatus, a plurality of rolls 2 are rotated to send a liquid crystal deflection film 3 in the direction indicated by A in FIG. The film 3 is colored.

  FIG. 2 is a schematic cross-sectional view showing one end portion of the roll 2 in the extending direction.

  As shown in FIG. 2, each roll 2 has a small-diameter cylindrical portion 5 at one end and the other end in the extending direction. In addition, the manufacturing apparatus includes ball bearings (hereinafter simply referred to as ball bearings) 8 with alignment rings at one end of each roll 2 and the other end of each roll 2. Each of the ball bearings 8 is disposed between the housing 6 of the manufacturing apparatus and the cylindrical portion 5 and supports the cylindrical portion 5 so as to be rotatable with respect to the housing 6. Each said ball bearing 8 is arrange | positioned in the said chemical | medical solution.

  FIG. 3 is a schematic cross-sectional view of the ball bearing 8 in the axial direction.

  The ball bearing 8 includes an outer ring 10, an inner ring 11, a plurality of balls 12, a centering ring 13, and a resin cage 15. The radial internal clearance of this ball bearing 8 is equal to or greater than the minimum radial internal clearance of the deep groove ball bearing defined in Japanese Industrial Standard C4 as of the end of November 2005 when it is first used. ing.

  The outer ring 10 has a substantially spherical alignment surface 31 on the outer peripheral side and a raceway groove 32 on the inner peripheral surface. The outer ring 10 is made of stainless steel containing 0.28 wt% to 0.33 wt% of carbon and 0.35 wt% to 0.40 wt% of nitrogen. The outer ring 10 is subjected to quenching and tempering. The nitrogen of 0.35 wt% or more and 0.40 wt% or less present in the outer ring 10 does not exist in a specific local area of the outer ring 10, and is present uniformly and substantially uniformly throughout the outer ring 10.

  On the other hand, the inner ring 11 is fitted and fixed to the outer peripheral surface of the cylindrical portion 5. The inner ring 11 has a raceway groove 33 on the outer peripheral surface thereof. The inner ring 11 is made of stainless steel containing 0.28 wt% to 0.33 wt% of carbon and 0.35 wt% to 0.40 wt% of nitrogen. The inner ring 11 is quenched and tempered. The nitrogen of 0.35 wt% or more and 0.40 wt% or less present in the inner ring 11 does not exist in a specific local area of the inner ring 11, and is present uniformly and uniformly throughout the inner ring 11.

  Each of the balls 12 is made of ceramic, and has increased wear resistance when used in a chemical solution. The plurality of balls 12 are disposed between the raceway grooves 32 of the outer ring 10 and the raceway grooves 33 of the inner ring 11 while being held by the cage 15 and spaced apart from each other in the circumferential direction.

  The aligning ring 13 is fitted and fixed to the inner peripheral surface of the housing 6 (see FIG. 2) of the manufacturing apparatus. The aligning ring 13 has a substantially spherical aligning surface 51 on its inner peripheral side. The aligning surface 51 has a shape corresponding to the substantially spherical aligning surface 31 of the outer ring 10. The alignment surface 51 of the alignment ring 13 and the alignment surface 31 of the outer ring 10 are fitted to each other.

  The aligning ring 13 has insertion grooves 40 and 41 extending in the axial direction of the aligning ring 1 at two locations on the aligning surface 51. Each of the insertion grooves 40 and 41 extends in the axial direction by a predetermined dimension from one end face in the axial direction of the aligning ring 13. Each insertion groove 40, 41 has a predetermined circumferential width.

  This ball bearing 8 is such that when the roll 2 is bent and a moment load is applied to the roll 2, and the cylindrical portion 5 that is the end of the roll 2 is inclined with respect to the central axis of the aligning ring 13, The outer ring 10 moves relative to the aligning ring 13. In this way, the ball bearing 8 is aligned so that the central axis of the ball bearing 8 substantially coincides with the axial center of the cylindrical portion 5 to absorb the deflection of the roll 2.

  FIG. 4 shows a case where the ball bearing with the aligning ring of the present invention and the conventional ball bearing with the aligning ring are used in a chemical solution (an aqueous solution containing boric acid and potassium iodide) for a certain period of time. It is one test figure which shows the value of the bearing radial clearance increased in the case of.

  In this test, in addition to the present invention, as a conventional example, two types of SUS630 having different components were used as the material for the raceway ring.

  In addition, the material of the race ring of the present invention includes carbon in an amount of 0.28 wt% to 0.33 wt% and nitrogen in an amount of 0.35 wt% to 0.40 wt%. In the range of weight% used in ordinary stainless steel, Si, Mn, P, S, Ni, Cr, Mo, V, Cu, Mb, W, Ti, Co are 0 except for Ni and Cr. The test was carried out with variation within a range including weight%.

  In addition, the conventional example and the high nitrogen material showing an embodiment of the present invention were tested by greatly differenting only the component ratio of carbon and nitrogen.

As shown in FIG. 4, in this test example, in any of the four tests, the amount of increase in the radial gap according to the embodiment of the present invention is greatly suppressed as compared with the conventional example using SUS630. And depending on the test example, the increase amount of the radial gap could be remarkably smaller than 1/3 as compared with the conventional case, and the wear resistance could be remarkably increased.
For this reason, the weight percent of carbon is limited to a very narrow region of 0.28 wt% to 0.33 wt%, and in addition to this, nitrogen is 0.35 wt% to 0.40 wt%. It was confirmed that a bearing having good wear resistance and corrosion resistance can be realized by limiting to the following extremely narrow region.

  According to the embodiment, since the alignment ring 13 having the alignment surface 51 for aligning is provided on the inner peripheral side on the radially outer side of the outer ring 10, the deflection film constituting the liquid crystal is provided. Even when used in an environment where a large moment load acts, such as a device to be manufactured, the moment load can be absorbed by the aligning function. Therefore, the wear resistance can be improved, and in particular, the wear resistance when used in an environment where a large moment load acts, such as an apparatus for producing a long deflection film, can be increased.

  Further, according to the above embodiment, since each of the outer ring 10 and the inner ring 11 contains 0.28% by weight or more of carbon, the structure of the outer ring 10 and the inner ring 11 can be subjected to martensitic transformation without any problem by quenching. It can be raised and the hardness can be increased. Further, toughness can be obtained by subsequent tempering. Therefore, wear resistance can be improved. The present inventor has confirmed that if carbon is smaller than 0.28% by weight, even if quenched, martensitic transformation does not occur sufficiently, and it becomes difficult to obtain a problem-free hardness. It is.

  In addition, according to the above embodiment, since 0.35% by weight or more of nitrogen exists in each of the outer ring 10 and the inner ring 11, the hardness can be further increased and the wear resistance can be increased. According to the present embodiment, since 0.35 wt% or more of nitrogen is added to 0.28 wt% or more of carbon, it is possible to realize hardness that is comparable to martensitic SUS440C. Thus, the wear resistance can be improved.

  Moreover, according to the said embodiment, since the carbon contained in each of the outer ring | wheel 10 and the inner ring | wheel 11 is 0.32 weight% or less, it can suppress that carbon couple | bonds with chromium and the corrosion resistance which chromium has has fallen. It is possible to suppress corrosion and realize corrosion resistance without problems.

  In order to obtain a sufficient hardness only with carbon, a hardness close to the maximum value can be obtained by adding about 0.60% by weight of carbon. However, the present inventor has found that if carbon is present in an amount of more than 0.32% by weight, the bonding between carbon and chromium is promoted to produce chromium carbide, and the corrosion resistance of chromium is lost. It was. Therefore, the upper limit of carbon is set so that the corrosion resistance is not lost, and in order to compensate for the insufficient hardness, 0.35 wt% or more of nitrogen that has obtained sufficient hardness in the test is contained.

  Moreover, according to the said embodiment, since nitrogen is 0.40 weight% or less, a nitrogen blowhole does not produce | generate frequently. Nitrogen is an intrusion-type solid solution element, has an extremely high solid solution strengthening ability, is an austenite phase stabilization element, and is a basic component of the present invention that is effective in improving corrosion resistance. Here, it was found that when the amount of nitrogen was less than 0.15% by weight, a δ ferrite phase was formed, leading to a decrease in strength. However, if it exceeds 0.40% by weight, it is confirmed that nitrogen blowholes are frequently generated, and in order to suppress the formation of nitrogen blowholes, a melting facility stored in a high-pressure environment of 10 atm or more is required. Become. Therefore, the manufacturing cost is increased. Moreover, when the weight% of nitrogen exceeds 0.40 weight%, the effect of promoting segregation of components during solidification has been confirmed, which is not preferable.

  Further, according to the above embodiment, the radial internal clearance is equal to or greater than the minimum radial internal clearance value of the deep groove ball bearing defined in Japanese Industrial Standard C4 as of the end of November 2005. The movement of the bearing can be made smoother and the bearing life can be further extended. The reason for this is not clear, but the present inventor believes that the wear powder generated in the bearing is a solution if the radial internal clearance is not less than the minimum value of C4 of Japanese Industrial Standard (JIS). It is presumed that this is because the bearing flows out smoothly and it becomes difficult for the bearing to bite the wear powder.

  In the above embodiment, the radial internal clearance of the ball bearing 8 is the minimum radial value of the deep groove ball bearing defined in C4 of the Japanese Industrial Standard as of the end of November 2005 when the use is started. The internal clearance value was exceeded. However, in the present invention, the radial internal clearance is less than the minimum radial internal clearance value of the deep groove ball bearing defined in Japanese Industrial Standard C4 as of the end of November 2005, when the use is started. Any small value may be used. And, for example, the radial internal clearance may be C2, CN, or C3 of Japanese Industrial Standards as of the end of November 2005 when the use is started. Even if the value is smaller than the value of the minimum radial internal clearance of the deep groove ball bearing defined in C4, the service life can be made longer than before.

  Moreover, the ball bearing 8 of the said embodiment was arrange | positioned at the liquid-crystal film manufacturing apparatus which colors the deflection film of a liquid crystal. However, the ball bearing with the aligning ring of the present invention may be used in apparatuses other than the liquid crystal film manufacturing apparatus, and may be used in any apparatus as long as it is disposed in an aqueous solution containing boric acid and potassium iodide. May be.

  Further, in the above embodiment, the ball bearing 8 is used in a harsh situation where the roll 2 is bent and disposed in a corrosive liquid and no lubricant is present. It had a centering ring 13. However, for example, when the film is short, the roll for carrying the film is short, and the roll is difficult to bend, in comparison with the present invention, it is possible to suitably use a ball bearing that is different only in that there is no aligning ring. Of course.

8 Ball bearing with aligning ring 10 Outer ring 11 Inner ring 12 Ball 13 Aligning ring 31 Centering surface of outer ring 32 Race groove of outer ring 33 Track groove of inner ring 51 Centering surface of aligning ring

Claims (2)

An inner ring having a raceway groove;
While having a raceway groove on the inner peripheral side, an outer ring having a centering surface for aligning on the outer peripheral side,
A ceramic ball disposed between the inner ring raceway groove and the outer ring raceway groove;
The outer ring is arranged on the outer side in the radial direction of the outer ring, and includes a aligning ring having an alignment surface on the inner peripheral side for aligning,
It is arranged in an aqueous solution containing boric acid and potassium iodide,
Each of the outer ring and the inner ring is made of stainless steel containing 0.28 wt% or more and 0.33 wt% or less of carbon and 0.35 wt% or more and 0.40 wt% or less of nitrogen.
A ball bearing with a centering ring, wherein each of the outer ring and the inner ring is quenched and tempered. In the ball bearing with the aligning ring according to claim 1,
A ball bearing with an aligning ring, characterized in that the radial internal clearance is equal to or greater than the minimum radial internal clearance value of the deep groove ball bearing defined in Japanese Industrial Standard C4 as of the end of November 2005.

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