JP2014040859A - Bearing lining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing lining method capable of easily preventing a reduction in strength of a lining layer formed by welding.SOLUTION: A bearing lining method comprises: a primary welding step S1 of sequentially forming primary overlay welding portions 1 extending in a first direction along a bearing surface 5 of a bearing at intervals toward a second direction perpendicular to the first direction with respect to the bearing surface 5; and a secondary welding step S2 of sequentially forming secondary overlay welding portions 2 extending in the first direction among the primary overlay welding portions 1 adjacent to one another on the bearing surface 5 such that each of the primary overlay welding portions 1 is interposed between each pair of the secondary overlay welding portions from the second direction.

Description

  The present invention relates to a bearing lining method using overlay welding on a bearing.

  For bearings used in various fields, a bearing material made of a low melting point metal such as white metal is lined on the inner peripheral surface of a cylindrical bearing body (back metal), and the lining layer has a specified thickness. Some are manufactured by cutting and polishing. In order to line the white metal on the back metal, tin or solder plating is applied to the back metal in advance, and the white metal is lined on the inner peripheral surface of the back metal by a centrifugal casting method or the like. In the centrifugal casting method, while rotating the cylindrical back metal around the axis, the bearing material is poured into the inner peripheral surface, and the bearing material is cooled and solidified while being attached to the inner peripheral surface of the back metal by centrifugal force. Is what you get.

  If there is a defect in the molding of the lining layer, that is, if there is a defect or coarse structure in the lining layer, the lining layer may peel off during use of the bearing, causing a fatal problem to the automobile or turbine that is being used. It can happen.

  In order to avoid such a state, small bearings such as automobile bearings are generally relatively inexpensive, and are used for a long time and replaced with new ones before they become unusable. However, since a large bearing used for a turbine or the like used for thermal power generation is expensive, a method of repairing an unusable bearing is used. As a repair method, there is a method in which the white metal lined on the back metal is deleted by machining, and then the centrifugal casting method or the like is used again in the same manner as in the new production. However, with this method, it is necessary to bring the bearing back to a workable place where casting equipment is provided in order to perform casting again, and it is difficult to perform on-site repair work. There is a problem of producing.

  Therefore, a bearing manufacturing / repair method in which the back metal is lined by overlay welding is used. For example, in Patent Document 1, instead of using a welding wire, a low-melting-point metal plate is molded and welded so as to be fitted to the inner peripheral surface, thereby obtaining a microstructure without segregation, thereby improving the durability of the bearing. There is a way to plan.

JP-A-3-79115

  However, in the method using overlay welding, the cooling rate of the welded portion decreases due to an increase in heat input, or the welded portion locally becomes high temperature due to repeated heat input, resulting in a component of crystal structure. Segregation may occur, leading to a decrease in the strength of the lining layer.

  The present invention has been made to solve the above-described problems, and provides a bearing lining method that can easily suppress a decrease in strength of a lining layer formed by welding.

In order to solve the above problems, the present invention proposes the following means.
The bearing lining method which concerns on 1 aspect of this invention is the 2nd direction orthogonal to the said 1st direction for the primary build-up weld part extended in the 1st direction along this bearing surface with respect to the bearing surface of a bearing. A secondary build-up weld that extends in the first direction between a primary welding step that is sequentially formed with an interval toward the surface and the primary build-up weld that is adjacent to the bearing surface. And a secondary welding step of sequentially forming the welded portion so as to sandwich the second welded portion from the second direction.

  According to such a structure, it can suppress the influence from the heat input of the primary build-up weld part formed adjacently by forming a primary build-up weld part at intervals. Furthermore, after forming the primary build-up weld, after forming the primary build-up weld by forming the primary build-up weld with the secondary build-up weld from the second direction, A secondary build-up weld is formed by emptying. Therefore, since the secondary build-up weld can be formed after the primary build-up weld is cooled, the locally applied heat input can be reduced. By these, the fall of a cooling rate can be suppressed and the crystal structure of a lining layer can be formed uniformly.

  In the bearing lining method according to another aspect of the present invention, the bearing surface is an inner peripheral surface of a bearing having a cylindrical shape, and the first direction is directed toward the axial direction of the bearing surface. The spiral direction is twisted in the circumferential direction of the bearing surface, and the second direction is the axial direction.

  According to such a configuration, the primary build-up weld is formed in the spiral direction that is twisted in the circumferential direction of the bearing surface as it goes in the axial direction with respect to the bearing surface that is the cylindrical inner peripheral surface. Further, it can be continuously formed in a spiral manner with an interval in the axial direction, and similarly, the secondary build-up weld can also be formed continuously by forming a spiral along the primary build-up weld. That is, the lining layer by welding can be easily formed with respect to the bearing surface by forming the primary build-up welded portion and the secondary build-up welded portion at a time.

  Furthermore, in the bearing lining method according to another aspect of the present invention, the bearing surface is an inner circumferential surface of a cylindrical bearing, and the first direction is a circumferential direction of the bearing surface, The two directions are axial directions of the bearing surface.

  According to such a configuration, after forming a plurality of primary build-up welds in a ring shape in the circumferential direction at intervals in the axial direction with respect to the bearing surface which is a cylindrical inner peripheral surface, a secondary wall is formed. Similarly, the build-up weld is formed in a ring shape so as to sandwich the primary build-up weld. Accordingly, it is possible to easily form a lining layer by welding in a circumferential direction with respect to the cylindrical inner peripheral surface so as to reduce the locally applied heat while suppressing the influence of heat input.

  Further, in the bearing lining method according to another aspect of the present invention, the bearing surface is an inner peripheral surface of a cylindrical bearing, and the first direction is an axial direction of the bearing surface, The two directions are circumferential directions of the bearing surface.

  According to such a configuration, after forming a plurality of primary build-up welds in the axial direction on the bearing surface, which is a cylindrical inner peripheral surface, with a plurality of intervals in the circumferential direction, Similarly, the build-up weld is formed in a straight line so as to sandwich the primary build-up weld. Accordingly, it is possible to easily form a lining layer by welding in the axial direction with respect to the cylindrical inner peripheral surface so as to reduce the locally applied heat while suppressing the influence of heat input. Furthermore, by forming a straight line in the axial direction, there is a distance in the reciprocation in the axial direction when forming each of the primary and secondary welds, and then forming the weld. Since it takes time to do so, cooling can be sufficiently performed.

  Furthermore, the bearing lining method according to another aspect of the present invention is characterized in that the bearing surface has a planar shape.

  According to such a configuration, the primary build-up welded portion extends linearly in the first direction with respect to the bearing surface having a planar shape, and is formed with an interval in the second direction. Similarly, the build-up weld is formed in a straight line so as to sandwich the primary build-up weld. Thereby, it is possible to easily form a lining layer by welding on the planar bearing surface so as to reduce the locally applied heat while suppressing the influence of heat input.

  Moreover, the bearing lining method which concerns on the other aspect of this invention is a said 1st direction between the said primary build-up weld part and the said secondary build-up weld part in the said bearing surface after the said secondary welding process. And an additional welding step of sequentially forming additional build-up welds extending in the second direction at intervals in the second direction.

  According to such a configuration, after the secondary build-up weld is formed, an additional build-up weld is formed between the secondary build-up weld and the primary build-up weld. It is possible to perform welding by further widening the distance between each other and the secondary build-up welds, and it is possible to further suppress the influence from heat input when forming the primary build-up welds and the secondary build-up welds. Thereby, the fall of a cooling rate can be suppressed more and the crystal structure of a lining layer can be formed more uniformly.

  Furthermore, in the bearing lining method according to another aspect of the present invention, the primary build-up weld and the secondary build-up weld are formed with a width in the second direction of 2 mm or more and 3 mm or less. It is characterized by.

  According to such a configuration, it becomes possible to further reduce the heat input of each build-up welded portion by narrowing the width of each build-up weld. Thereby, the fall of a cooling rate can further be suppressed and the crystal structure of a lining layer can be formed more uniformly.

  In the bearing lining method according to another aspect of the present invention, the welding speed in the primary welding process and the secondary welding process is the evaluation data relating the welding speed and the welding quality, and the welding speed set in advance. It is further characterized in that it is determined based on an allowable limit and a preset welding quality allowable limit.

  According to such a configuration, the welding speed is determined from the welding speed allowable limit calculated from the allowable time when welding is actually performed and the welding quality limit calculated from the required strength. The welded portion having the required strength can be formed at the optimum welding speed, and the welding time can be shortened.

  According to the bearing lining method of the present invention, the effect of heat input by the welded portion formed next is suppressed, or the heat input given locally is suppressed, so that the cooling rate is reduced and the lining layer crystals are suppressed. A structure can be formed uniformly, and a decrease in strength of the lining layer formed by welding can be easily suppressed.

The schematic diagram explaining the process of the bearing lining method which concerns on 1st embodiment of this invention, The figure (a) is a side view after completion of a welding process, The figure (b) is a cross-sectional view after a primary welding process, FIG. 2C is a cross-sectional view after the secondary welding process. The schematic diagram explaining the process of the bearing lining method which concerns on 2nd embodiment of this invention, The figure (a) is a side view after completion of a welding process, The figure (b) is a cross-sectional view after a primary welding process, FIG. 2C is a cross-sectional view after the secondary welding process. The schematic diagram explaining the process of the bearing lining method which concerns on 3rd embodiment of this invention, The figure (a) is a side view after a primary welding process, The figure (b) is the side view after a secondary welding process, FIG. 4B is a cross-sectional view after the primary welding process, and FIG. 4C is a cross-sectional view after the secondary welding process. The schematic diagram explaining the process of the bearing lining method which concerns on 4th embodiment of this invention, The figure (a) is a perspective view after a primary welding process, The figure (b) is a perspective view after a secondary welding process. is there. It is a schematic diagram explaining the process of the bearing lining method which concerns on 5th embodiment of this invention, The figure (a) is a cross-sectional view after a primary welding process, The figure (b) is a cross-section after a secondary welding process. The figure and the figure (c) are the cross-sectional views after an additional welding process. FIG. 5 is a schematic diagram for explaining a process of a bearing lining method according to a modification of the present invention, in which FIG. (A) is a perspective view after a primary plane vortex welding process, and (b) is a perspective view after a secondary plane vortex welding process. FIG. It is a graph showing the relationship between the welding speed and the welding quality in the bearing lining method which concerns on 6th embodiment of this invention.

Hereinafter, a first embodiment according to the present invention will be described with reference to FIG.
As shown to Fig.1 (a), the bearing lining method of 1st embodiment is the primary welding process S1 which forms the primary build-up weld part 1 by build-up welding with respect to the bearing surface 5 of the bearing 4, and a primary A secondary welding step S2 for forming the secondary build-up weld 2 after the welding step S1.
The bearing 4 is, for example, a plain bearing, has a cylindrical shape centered on the axis O, and has a bearing surface 5 that is a cylindrical inner peripheral surface.

  As shown in FIG.1 (b), primary welding process S1 forms the primary build-up welding part 1 which makes spiral shape on the bearing surface 5 which is a cylindrical internal peripheral surface. The primary build-up weld 1 proceeds in the circumferential direction of the bearing surface 5 toward the axial direction that is the first direction in the first embodiment on the bearing surface 5 while proceeding in the axial direction that is the second direction in the first embodiment. A plurality of strips are successively formed at intervals of one strip while drawing in a spiral shape by turning in a spiral direction to be twisted.

  As shown in FIG.1 (c), secondary welding process S2 of primary build-up welding part 1 which makes spiral shape after primary build-up welding part 1 formed by primary welding process S1 is fully cooled. The secondary build-up weld 2 is formed so as to sandwich one line and one line from the axial direction. The secondary build-up weld 2 turns in a spiral direction on the bearing surface 5 while moving in the axial direction, and turns in a spiral direction that twists in the circumferential direction of the bearing surface 5 toward the axial direction to draw a spiral shape. However, a plurality of strips are successively formed along the primary build-up weld 1 so that the primary build-up weld 1 is sandwiched between the secondary build-up welds 2.

Next, the operation of the bearing lining method having the above configuration will be described.
According to the above bearing lining method, the influence from the heat input of the primary build-up weld 1 formed adjacent to each other is formed by forming the primary build-up weld 1 with a gap for each line. Can do. Furthermore, after forming the primary build-up weld 1, the primary build-up weld 2 is formed so that the secondary build-up weld 2 is sandwiched between the primary build-up welds 1. After forming the build-up weld 1, the secondary build-up weld 2 is formed with a time interval. Therefore, since the secondary build-up weld 2 can be formed after the primary build-up weld 1 is cooled, the locally applied heat input can be reduced. As a result, a decrease in cooling rate can be suppressed, a crystal structure of the lining layer can be formed uniformly, and a decrease in strength of the lining layer can be suppressed.

  Further, the primary build-up weld 1 can be continuously formed on the bearing surface 5 that is a cylindrical inner peripheral surface at intervals in the axial direction in a spiral manner, and similarly, secondary build-up welding is performed. The part 2 can also be formed continuously by forming a spiral shape along the primary build-up weld 1. In other words, because of the spiral shape, the primary build-up weld 1 and the secondary build-up weld 2 are formed in succession once in a space while being spaced apart, so that the lining layer by welding is formed on the bearing surface 5. It can be formed easily.

Next, the bearing lining method of the second embodiment will be described with reference to FIG.
In the second embodiment, the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof is omitted. The bearing lining method of the second embodiment is different from the first embodiment with respect to the primary welding step S1 and the secondary welding step S2.

  That is, in 2nd embodiment, after the primary ring welding process S11 which forms the primary ring build-up welding part 11 by overlay welding with respect to the bearing surface 5 which is a cylindrical internal peripheral surface, and primary ring welding process S11 A secondary ring welding step S21 for forming the secondary ring build-up weld 21.

  As shown in FIGS. 2A and 2B, the primary ring welding step S11 is performed after the primary ring build-up weld 11 is formed in a ring shape on the bearing surface 5 which is a cylindrical inner peripheral surface. A plurality of primary ring build-up welds 11 are formed at intervals in the axial direction that is the second direction in the second embodiment. The primary ring build-up weld 11 is formed in a ring shape extending on the bearing surface 5 in the circumferential direction centering on the axis O that is the first direction in the second embodiment.

  As shown in FIG. 2 (c), the secondary ring welding step S21 is the same as the primary ring welding build-up portion after the primary ring build-up weld portion 11 formed in the primary ring welding step S11 is sufficiently cooled. By this method, a plurality of secondary ring weld overlays are formed along the primary ring overlay weld 11 so as to sandwich the primary ring overlay weld 11 from the axial direction. The secondary ring build-up welded portion 21 is formed in a ring shape extending on the bearing surface 5 in the circumferential direction around the axis O.

  According to the bearing lining method of the second embodiment as described above, the axial direction so that the primary ring build-up welded portion 11 forms a ring shape in the circumferential direction with respect to the bearing surface 5 which is a cylindrical inner peripheral surface. The secondary ring build-up welds 21 are similarly formed so as to sandwich the primary build-up weld 1 so as to form a ring shape in the circumferential direction. As a result, a lining layer formed by welding that suppresses the influence of heat input exerted on the primary ring build-up welded portion 11 and the secondary ring build-up welded portion 21 with each other and also reduces the locally applied heat is formed into a cylindrical shape. It can be easily formed in the circumferential direction with respect to the inner peripheral surface of the shape.

Next, the bearing lining method of the third embodiment will be described with reference to FIG.
In the third embodiment, the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof is omitted. The bearing 4 repair method of the third embodiment is different from the first embodiment with respect to the shapes of the primary build-up weld 1 and the secondary build-up weld 2.

  That is, in the third embodiment, after the primary linear welding process S12 and the primary linear welding process S12 in which the primary linear overlay welding part 12 is formed by overlay welding on the bearing surface 5 which is a cylindrical inner peripheral surface. A secondary linear welding step S22 for forming the secondary linear build-up welded portion 22.

  As shown in FIGS. 3A and 3B, in the primary linear welding step S <b> 12, the primary linear build-up weld 12 is linearly formed on the bearing surface 5 that is a cylindrical inner peripheral surface. After that, a plurality of primary linear build-up welds 12 are formed at intervals in the clockwise direction around the axis O that is the second direction in the third embodiment. The primary linear build-up welded portion 12 is formed so as to extend linearly on the bearing surface 5 in the axial direction that is the first direction in the third embodiment.

  As shown in FIGS. 3C and 3D, the secondary linear welding process S22 is performed after the primary linear overlay welding part 12 formed in the primary linear welding process S12 is sufficiently cooled. In the same manner as the welded portion 12, the secondary straight overlay welded portion 22 is formed so as to be sandwiched from the circumferential direction along the primary straight overlay welded portion 12. The secondary straight built-up welded portion 22 is formed so as to extend linearly on the bearing surface 5 in the axial direction.

  According to the bearing lining method of the third embodiment as described above, with respect to the bearing surface 5 which is a cylindrical inner peripheral surface, the primary linear overlay welding portion 12 is linearly formed in the axial direction, and the axis O is After forming a plurality at intervals in the circumferential direction as the center, the secondary linear build-up welds 22 are similarly formed linearly so as to sandwich the primary straight build-up welds 12. As a result, a lining layer formed by welding which suppresses the influence of heat input exerted on the primary linear build-up welded portion 12 and the secondary linear build-up welded portion 22 and reduces the locally applied heat is formed into a cylindrical shape. It can be easily formed in the axial direction with respect to the inner peripheral surface of the shape. In addition, by forming linearly in the axial direction, there is a distance in the axial reciprocation when forming each of the primary linear build-up weld 12 and the secondary straight build-up weld 22. Since it takes time to form the welded portion, the cooling can be sufficiently performed, and the decrease in the strength of the lining layer can be effectively suppressed.

Next, a bearing lining method according to a fourth embodiment will be described with reference to FIG.
In the fourth embodiment, the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof is omitted. The bearing lining method of the fourth embodiment is different from that of the first embodiment with respect to the shape of the bearing surface 5 and the primary welding step S1 and the secondary welding step S2.

That is, in the fourth embodiment, as shown in FIGS. 4 (a) and 4 (b), a primary planar overlay welded portion is formed by overlay welding on a planar bearing surface 51 that is a flat surface forming a cylindrical top surface. The primary plane welding process S13 which forms 13 and the secondary plane welding process S23 which forms the secondary plane overlay welding part 23 after the primary plane welding process S13 are provided.
The bearing 4 is, for example, a thrust bearing, has a cylindrical shape centered on the axis O, and has a flat bearing surface 51 that is a top surface of the cylinder and is a plane orthogonal to the axis O.

  As shown to Fig.4 (a), primary plane welding process S13 is straight line toward 1st plane direction X (FIG. 4 paper surface depth direction) which is the 1st direction in 4th embodiment along the plane bearing surface 51. As shown in FIG. After forming the primary plane build-up weld 13 in the shape, the second plane direction Y in the fourth embodiment and perpendicular to the first plane direction X along the bearing surface 5 (left and right direction in FIG. 4). A plurality of primary plane build-up welds 13 are formed at intervals. The primary planar overlay welded portion 13 is formed so as to extend in the first planar direction X on the planar bearing surface 51 and form a linear shape.

  As shown in FIG. 4B, the secondary flat surface welding step S23 is performed after the primary flat surface buildup welded portion 13 formed in the primary flat surface weld step S13 is sufficiently cooled. In the same manner, the secondary planar overlay welded portion 23 is formed so as to be sandwiched from the second planar direction Y along the primary planar overlay welded portion 13. The secondary plane build-up welded portion 23 is formed to extend in the first plane direction X to be linear.

  According to the bearing lining method of the fourth embodiment as described above, the primary planar overlay weld portion 13 is linearly formed in the first plane direction X with respect to the bearing surface 5 having a planar shape such as a thrust bearing. Then, the secondary plane build-up welded portion 23 is similarly formed in a straight line so as to sandwich the primary plane build-up welded portion 13. As a result, a lining layer formed by welding that suppresses the influence of heat input exerted on the primary plane build-up welded portion 13 and the secondary plane build-up welded portion 23 to each other and further reduces the locally applied heat input, It is possible to easily weld the planar bearing surface 51 having a shape.

Next, a bearing lining method according to a fifth embodiment will be described with reference to FIG.
In the fifth embodiment, the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof is omitted. The bearing lining method of the fifth embodiment is different from the first embodiment with respect to the primary welding step S1 and the secondary welding step S2.

  That is, in the fifth embodiment, as shown in FIGS. 5A to 5C, primary overlay welding is performed by overlay welding on the bearing surface 5 which is the inner peripheral surface of the cylindrical bearing 4. A primary fine welding step S14 for forming the portion 14, a secondary fine welding step S24 for forming a secondary thin overlay weld after the primary fine weld step S14, and an additional overlay weld 34 after the secondary fine weld step S24. The additional welding 0 process S34 which forms is provided.

  As shown in FIG. 5A, in the primary fine welding step S14, a primary build-up thin welded portion 14 having a spiral shape is formed on the bearing surface 5 which is a cylindrical inner peripheral surface. The primary build-up thin welded portion 14 has a width of 2 to 3 mm and swivels on the bearing surface 5 in the spiral direction that is the first direction in the fifth embodiment while proceeding in the axial direction that is the second direction in the fifth embodiment. Then, while drawing a spiral shape, a plurality of strips are successively formed at intervals of approximately two strips for each strip.

  As shown in FIG. 5 (b), the secondary fine welding process S24 includes a primary build-up process that forms a spiral shape after the primary build-up weld part 14 formed in the primary thin weld process S14 is sufficiently cooled. The secondary build-up welded portion 24 is formed so as to be adjacent to one line of the welded portion 14 without overlapping. The secondary built-up thin welded portion 24 has a width of 2 to 3 mm, and while rotating in the axial direction, swivels on the bearing surface 5 in a spiral direction to draw a spiral shape, and continuously plurally spaced in the axial direction. Articles are formed sequentially.

  As shown in FIG. 5C, in the additional welding step S34, after the secondary build-up welded portion 24 formed by the secondary fine weld step S24 is sufficiently cooled, the secondary build-up welded portion 24 is obtained. The additional build-up weld 34 is formed so as to be adjacent to one line of the spiral formed by each of the primary build-up welds 14. The additional build-up weld 34 has a width of 2 to 3 mm and is formed in a spiral shape by turning on the bearing surface 5 in the spiral direction while proceeding in the axial direction. A plurality of strips are successively formed so as to be sandwiched between the welded portion 24 and the primary build-up welded portion 1.

  According to the bearing lining method of the fifth embodiment as described above, after the secondary build-up welded portion 24 is formed, between the secondary build-up welded portion 24 and the primary build-up welded portion 14, In order to form the additional build-up weld 34, the primary build-up welds 14 and the secondary build-up welds 24 can be further widened and welded, and the adjacent primary build-up welds 14 are adjacent to each other. And the influence from the heat input at the time of forming the secondary overlay welding part 24 can be suppressed more. Thereby, the fall of a cooling rate can be suppressed more, the crystal structure of a lining layer can be formed more uniformly, and the fall of the intensity | strength of a lining layer can be suppressed more efficiently.

  Further, by setting the width of the primary build-up welded portion 14, the secondary build-up welded portion 24, and the additional build-up welded portion 34 narrowly within a range of 2 mm or more and 3 mm or less, each welding can be entered. Heat can be further reduced. Thereby, the fall of a cooling rate can further be suppressed, the crystal structure of a lining layer can be formed more uniformly, and the fall of the intensity | strength of a lining layer can be suppressed much more efficiently.

In addition, the primary build-up welded part 14, the secondary build-up welded part 24, and the additional build-up welded part 34 may be formed at intervals.
Further, a welding process may be additionally performed. Thereby, since the space | interval of the build-up welding part formed in each welding process further spreads, the influence of heat input can be suppressed more.

Next, a modified example of the bearing lining method will be described with reference to FIG.
In the modification, the same reference numerals are given to the same components as those in the fourth embodiment, and detailed description thereof is omitted. The bearing lining method of this modification is different from the first embodiment in the primary plane vortex welding step S15 and the secondary plane vortex welding step S25.

  That is, in the modified example, as shown in FIGS. 6A and 6B, primary welding is performed on the flat bearing surface 51 that is a flat surface forming a cylindrical top surface by overlay welding as in the fourth embodiment. A primary plane vortex welding process S15 for forming the planar vortex buildup weld 15 and a secondary plane vortex welding process S25 for forming the secondary plane vortex buildup weld 25 after the primary plane vortex welding process S15 are provided.

  As shown in FIG. 6A, in the primary plane vortex welding step S15, the radial direction on the planar bearing surface 51 is set as the second direction, and the direction twisted in the circumferential direction of the planar bearing surface 51 as the radial direction is increased. As one direction, a plurality of primary plane vortex welds are successively formed at intervals for each line while drawing a vortex shape.

  As shown in FIG. 6 (b), the secondary plane vortex welding step S25 is performed after the primary plane vortex overlay welding portion 15 formed in the primary plane vortex welding step S15 is sufficiently cooled. The secondary plane vortex buildup weld 25 is formed while drawing a vortex shape along the primary plane vortex buildup weld 15 in the same manner as the section 15.

  According to the bearing lining method of the modification as described above, the same effect as that of the first embodiment can be obtained for the bearing surface 5 having a planar shape such as a thrust bearing. That is, the primary plane vortex build-up welded portion 15 can be continuously formed in a spiral shape with a single gap spaced apart from the planar bearing surface 51 having a planar shape. It can form continuously by forming in a vortex shape along the primary plane eddy overlay welding part 15. That is, because of the vortex shape, the primary plane vortex buildup welded portion 15 and the secondary plane vortex buildup welded portion 25 are continuously formed in one time while being spaced apart, so that the lining layer formed by welding is a flat bearing. The surface 51 can be easily formed.

Next, the bearing lining method of 6th embodiment is demonstrated.
In the fifth embodiment, the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof is omitted. The bearing lining method of the sixth embodiment is different from the first embodiment in that the welding speed V is determined for the primary welding step S1 and the secondary welding step S2.

  That is, in the sixth embodiment, the primary welding step S1 and the secondary welding step S2 are performed while the welding torch performing overlay welding moves in the axial direction while the bearing 4 is fixed and rotated, and the welding speed during welding is performed. V is determined by an evaluation database obtained in advance, a welding speed allowable limit V1 set in advance, and a welding quality allowable limit Q1 set in advance. In addition, the welding part formed by primary welding process S1 and secondary welding process S2 is the primary build-up weld part 1 and the secondary build-up weld part 2 which make spiral shape similarly to 1st embodiment.

The welding speed V includes a rotational speed V _{r at} which the bearing 4 rotates in the circumferential direction around the axis O, and a feed speed V _f that is a speed at which the welding torch performing overlay welding moves in the axial direction along the axis O. Determined by. The evaluation database is a set of evaluation data in which the relationship between the welding speed V and the welding quality Q is summarized in advance for each size of the bearing 4. The evaluation data is represented by, for example, a graph shown in FIG. The weld quality Q is the strength of the welded portion, and can be obtained by observing the homogenization level of the welded portion with an electron microscope or the like, or performing a tensile test or the like. The welding speed allowable limit Vl is calculated in advance from the time during which welding can be performed on the bearing 4 when actual welding is performed. The welding quality tolerance limit Ql is calculated in advance from mechanical characteristics such as strength required for the bearing 4 on which the lining layer is formed.

  As shown in FIG. 7, the welding speed V selects the evaluation data of the target bearing 4 from the evaluation database compiled in advance after the size of the bearing 4 is determined. Thereafter, by inputting the welding speed allowable limit V1 and the welding quality allowable limit Q1 into the evaluation data, the welding quality Q is equal to or lower than the welding speed allowable limit Q1 and is equal to or lower than the welding speed allowable limit V1 from the evaluation data. The optimum welding speed V can be determined by deriving the points that can be obtained.

According to the bearing lining method of the sixth embodiment as described above, the welding speed allowable limit V1 calculated from the allowable time when the primary welding step S1 and the secondary welding step S2 are actually performed and the necessary strength. By determining the welding speed V based on the calculated welding quality tolerance limit Q1, the primary build-up weld 1 and the secondary build-up weld 2 having the required strength are formed at the optimum welding speed V. This can shorten the welding time.
The welding speed V may be determined by calculation from necessary data by a person, or may be determined mechanically by inputting necessary data using a program or the like.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the configurations and combinations of the embodiments in the embodiments are examples, and the addition and omission of configurations are within the scope not departing from the gist of the present invention. , Substitutions, and other changes are possible. Further, the present invention is not limited by the embodiments, and is limited only by the scope of the claims.

Moreover, in each embodiment, the weld parts formed by another welding processes, such as the primary build-up weld part 1 and the secondary build-up weld part 2, may mutually adjoin and may be formed apart. .
Further, the bearing lining method of the present invention may be applied not only to the method of each embodiment when repairing the lining layer of the bearing, but also to the manufacture of a new product.

O ... Axis 4 ... Bearing 5 ... Bearing surface S1 ... Primary welding process S2 ... Secondary welding process 1 ... Primary built-up weld 2 ... Secondary built-up weld S11 ... Primary ring welding process S21 ... Secondary ring welding process 11 ... Primary ring build-up weld 21 ... Secondary ring build-up weld S12 ... Primary straight weld process S22 ... Secondary straight weld process 12 ... Primary straight build-up weld 22 ... Secondary straight build-up weld X X ... First Planar direction Y ... Second plane direction 51 ... Plane bearing surface S13 ... Primary plane welding process S23 ... Secondary plane welding process 13 ... Primary plane overlay welding part 23 ... Secondary plane overlay welding part S14 ... Primary fine welding process S24 ... secondary fine welding process S34 ... additional welding process 14 ... primary overlay welding part 24 ... secondary overlay welding part 34 ... addition welding part S15 ... primary plane vortex welding process S25 ... secondary plane vortex welding process 15 ... Primary plane vortex overlay welding 25 ... secondary plane vortices overlay weld part V ... welding speed Q ... weld quality V r _... rotational speed V f _... feedrate V1 ... welding speed permissible limit Q1 ... welding quality allowable limit

Claims (8)

Primary welding that sequentially forms primary build-up welds extending in the first direction along the bearing surface at intervals in the second direction perpendicular to the first direction with respect to the bearing surface of the bearing. Process,
A secondary build-up weld extending in the first direction is sequentially formed between the primary build-up welds adjacent on the bearing surface so as to sandwich the primary build-up weld from the second direction. And a secondary welding step. A bearing lining method comprising: The bearing surface is an inner peripheral surface of a cylindrical bearing,
The first direction is a spiral direction twisted in the circumferential direction of the bearing surface as it goes in the axial direction of the bearing surface;
The bearing lining method according to claim 1, wherein the second direction is the axial direction. The bearing surface is an inner peripheral surface of a cylindrical bearing,
The first direction is a circumferential direction of the bearing surface;
The bearing lining method according to claim 1, wherein the second direction is an axial direction of the bearing surface. The bearing surface is an inner peripheral surface of a cylindrical bearing,
The first direction is an axial direction of the bearing surface;
The bearing lining method according to claim 1, wherein the second direction is a circumferential direction of the bearing surface.   The bearing lining method according to claim 1, wherein the bearing surface has a planar shape.   After the secondary welding step, an additional build-up weld extending in the first direction is provided between the primary build-up weld and the secondary build-up weld on the bearing surface in the second direction. The bearing lining method according to any one of claims 1 to 5, further comprising an additional welding step of sequentially forming at an interval.   The said primary build-up weld part and the said secondary build-up weld part are formed as a range whose said 2nd direction width is 2 mm or more and 3 mm or less, It is any one of Claim 1 to 6 characterized by the above-mentioned. The bearing lining method as described. The welding speed in the primary welding process and the secondary welding process is:
Evaluation data relating welding speed and welding quality,
Preset welding speed tolerance limits;
Preset welding quality tolerance limits;
The bearing lining method according to any one of claims 1 to 7, further comprising: determining based on the equation (1).

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