WO2019225613A1 - Elevator sheave and method for manufacturing same - Google Patents

Abstract

Provided is an elevator sheave that is capable of reducing abrasion generated in a winding groove. An elevator sheave 61 on which a wire rope 3 is wound is provided with: a cylindrical sheave body 611 which has, in the outer circumferential surface thereof, a winding groove 612 formed so as to extend in a circumferential direction and in which the wire rope 3 is fitted in the winding groove 612; and a metal layer 614 that is provided to the inner wall surface 613 of the winding groove 612 and that is brought into contact with the wire rope 3, wherein the hardness of the metal layer 614 is more than that of the sheave body 611.

Description

Elevator sheave and its manufacturing method

The present invention relates to an elevator sheave on which a suspended body is wound and a manufacturing method thereof.

Conventionally, a cylindrical elevator sheave on which a wire rope as a suspended body is wound is known. A winding groove into which a wire rope is fitted extends in the circumferential direction on the outer peripheral surface of the elevator sheave (see, for example, Patent Document 1).

Japanese Patent No. 3724322

However, wear is generated in the winding groove due to the friction generated between the winding groove and the wire rope. When a plurality of winding grooves are formed in the elevator sheave, a difference in wear amount occurs between the plurality of winding grooves. When there is a difference in the amount of wear between the plurality of winding grooves, it is necessary to re-polish each of the plurality of winding grooves in order to make the shapes of the plurality of winding grooves uniform. There was a problem.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator sheave that can reduce wear generated in a winding groove and a method for manufacturing the same. is there.

An elevator sheave according to the present invention is provided on a cylindrical sheave main body in which a winding groove extending in the circumferential direction is formed on an outer peripheral surface, and a suspension body is fitted in the winding groove, and an inner wall surface of the winding groove. The metal layer is in contact with the suspended body, and the hardness of the metal layer is higher than the hardness of the sheave body.

According to the elevator sheave according to the present invention, a metal layer having a hardness higher than the hardness of the sheave body is provided on the inner wall surface of the winding groove of the sheave body. Thereby, the abrasion which generate | occur | produces in a winding groove | channel can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the elevator apparatus provided with the elevator sheave which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the elevator hoisting machine of FIG. It is an enlarged view which shows the principal part of the sheave for elevators of FIG. It is a figure which shows the manufacturing method of the sheave for elevators of FIG. It is a flowchart which shows the manufacturing method of the sheave for elevators of FIG. It is sectional drawing which shows the principal part of the elevator sheave which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the principal part of the elevator sheave which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the principal part of the elevator sheave which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the principal part of the elevator sheave which concerns on Embodiment 5 of this invention. It is sectional drawing which shows the principal part of the elevator sheave which concerns on Embodiment 6 of this invention. It is sectional drawing which shows the principal part of the elevator sheave which concerns on Embodiment 7 of this invention. It is sectional drawing which shows the casting_mold | template in which the sheave main body and buffer metal layer piece of FIG. 11 are formed. It is sectional drawing which shows the sheave main body and buffer metal layer piece which were manufactured with the casting_mold | template of FIG. It is sectional drawing which shows the principal part of the elevator sheave which concerns on Embodiment 8 of this invention. It is sectional drawing which shows the casting_mold | template in which the sheave main body of FIG. 14 is formed. It is sectional drawing which shows the sheave main body manufactured with the casting_mold | template of FIG.

Embodiment 1 FIG.
1 is a configuration diagram illustrating an elevator apparatus including an elevator sheave according to Embodiment 1 of the present invention. The elevator apparatus is provided in the hoistway 1, provided in the hoistway 1, a car room 2 in which people and cargo are placed, a wire rope 3 that is a suspended body with one end connected to the car room 2, and A counterweight 4 connected to the other end of the wire rope 3 is provided. Further, the elevator apparatus is provided in the hoistway 1 and guides a car room 2 (not shown) that guides the car room 2 in the vertical direction, and is provided in the hoistway 1 and the counterweight (not shown) that guides the counterweight 4 in the vertical direction. Guide rails. As the wire rope 3 moves, the car room 2 and the counterweight 4 move up and down the hoistway 1 in opposite directions.

Further, the elevator apparatus is provided in the machine room 5 and includes an elevator hoisting machine 6 that raises and lowers the car room 2 and the counterweight 4, and a plurality of pulleys 7 provided in the machine room 5. The wire rope 3 is wound around an elevator hoist 6 and a pulley 7. When the elevator hoisting machine 6 is driven, the wire rope 3 moves. The plurality of pulleys 7 keep the frictional force generated between the elevator hoist 6 and the wire rope 3 in an appropriate state.

The present invention is mainly related to the elevator hoisting machine 6. Therefore, description of other general components included in the elevator apparatus is omitted.

The elevator device raises and lowers people and cargo in the height direction. Examples of the energy used for the elevator apparatus include electric energy and hydraulic energy. In this example, electrical energy is used in the elevator apparatus. A motor is used as a drive device for the elevator apparatus. The motor converts the electrical energy of the three-phase AC power source into rotational kinetic energy using an electromagnetic coil.

Rotational kinetic energy of the motor is used to move the wire rope 3 by the frictional force generated between the elevator hoist 6 and the wire rope 3. As the wire rope 3 moves, the car room 2 and the counterweight 4 move up and down the hoistway 1. In other words, the rotational kinetic energy of the motor is used for raising and lowering the cab 2 and the counterweight 4.

In addition, in this example, although the structure where the machine room 5 is arrange | positioned above the hoistway 1 is demonstrated, depending on the specification of the building structure in which an elevator apparatus is installed, the machine room 5 is arrange | positioned near the ground. It may be a configuration. Further, when there is no room for the machine room 5 to be disposed, the machine room 5 may not be provided. When there is no machine room 5, the elevator hoist 6 is arranged in the hoistway 1. When there is no machine room 5, a thin elevator hoisting machine 6 is used as the elevator hoisting machine 6.

As the cab 2, sheet metal parts made of steel materials are used. From the viewpoint of safety, the car room 2 is configured such that the user's hands and feet do not easily come out of the car room 2 from the inside of the car room 2. As the cab 2 and the hoistway 1, steel materials are used from the viewpoint of mechanical strength and the viewpoint of fire fighting.

As the wire rope 3, a strand in which a plurality of steel wires are twisted together is made, and the strand is further twisted around the main wire. The suspended body is not limited to the wire rope 3 and may be a belt, for example.

A frictional force is generated between the elevator hoist 6 and the wire rope 3. Therefore, a portion of the elevator hoist 6 on which the wire rope 3 is wound needs to have the same hardness and strength as the wire rope 3. A portion around the wire rope 3 in the elevator hoisting machine 6 is made of a steel material, an iron-based alloy material, or the like. The portion of the pulley 7 on which the wire rope 3 is hung is made of a steel material, an iron-based alloy material, or the like, similarly to the portion of the elevator hoisting machine 6 on which the wire rope 3 is hung.

FIG. 2 is a cross-sectional view showing the elevator hoisting machine 6 of FIG. The elevator hoisting machine 6 includes an elevator sheave 61 around which the wire rope 3 is wound, a motor 62 that rotates the elevator sheave 61, and a housing 63 that supports the motor 62.

The elevator hoisting machine 6 is divided into two parts: a rotating rotor side part and a stator side part fixed to the hoistway 1. The stator side portion includes the permanent magnets of the housing 63 and the motor 62. The rotor side portion includes the elevator sheave 61 and the electromagnetic coil of the motor 62. Current is supplied to the electromagnetic coil of the motor 62 from the stator side portion. The electromagnetic coil of the motor 62 generates a magnetic force using the supplied current. Thereby, the electromagnetic coil of the motor 62 converts electrical energy into rotational kinetic energy.

The elevator sheave 61 includes a cylindrical sheave main body 611 that serves as a center of rotational movement. A plurality of winding grooves 612 extending in the circumferential direction of the sheave body 611 are formed on the outer peripheral surface of the sheave body 611. The plurality of winding grooves 612 are arranged side by side in the axial direction of the sheave main body 611. The wire rope 3 is fitted in the winding groove 612. By fitting the wire rope 3 in the winding groove 612, the wire rope 3 is always wound around the sheave main body 611 at the same position. In other words, the movement of the wire rope 3 in the axial direction of the sheave body 611 with respect to the sheave body 611 is restricted.

The housing 63 and the sheave body 611 are manufactured by a gravity casting method. The gravity casting method is a method in which a molten iron-based alloy is poured into a sand mold formed using a wooden mold as a master, and the same shape as the master is manufactured.

Each shape of the housing 63 and the sheave main body 611 is a complicated shape. Therefore, it is not economical to cut out the housing 63 and the sheave main body 611 from a lump of steel material called billet. For manufacturing the housing 63 and the sheave main body 611, a gravity casting method with excellent productivity is used.

A portion of the sheave body 611 that does not require wear resistance when a high-hardness metal that is applicable to the gravity casting method and has improved wear resistance is used as the material of the sheave body 611 Is also composed of a high hardness metal. As a result, the material cost of the sheave main body 611 increases.

After the gravity casting process of the sheave body 611, a cutting machining process of the sheave body 611 is performed as a finishing process of the sheave body 611. In the cutting machining process of the sheave body 611, the winding groove 612 of the sheave body 611 is finished, and the portion connected to the motor and the portion connected to other parts in the sheave body 611 are finished. When the entire sheave body 611 is made of a high-hardness metal, the condition range for cutting machining is narrowed. Thereby, the productivity of the sheave main body 611 decreases. Moreover, when the whole sheave main body 611 is comprised from the high hardness metal, the tool used for cutting is consumed earlier, and the lifetime of a tool becomes shorter. As a result, the cost of the tool used for cutting the sheave body 611 increases.

In the present invention, the material of the housing 63 and the sheave body 611 is made of cast steel. Thereby, the economical efficiency and productivity of the elevator sheave 61 can be improved.

FIG. 3 is an enlarged view showing a main part of the elevator sheave 61 of FIG. In FIG. 3, the cross section about the radial direction in the sheave 61 for elevators is shown. The elevator sheave 61 further includes a metal layer 614 provided on the inner wall surface 613 of the winding groove 612. In this example, the metal layer 614 is provided on the side surface portion of the inner wall surface 613 of the winding groove 612. The metal layer 614 is in contact with the wire rope 3 fitted in the winding groove 612. The surface in contact with the wire rope 3 in the metal layer 614 becomes the contact surface 615 of the elevator sheave 61. A frictional force is generated between the contact surface 615 and the wire rope 3.

After the cutting process of the sheave main body 611, the metal layer 614 is provided on the inner wall surface 613 of the winding groove 612. The hardness of the metal layer 614 is higher than the hardness of the sheave body 611. Thereby, the abrasion resistance of the elevator sheave 61 can be improved.

FIG. 4 is a diagram showing a method of manufacturing the elevator sheave 61 of FIG. As a method of forming the metal layer 614 on the inner wall surface 613 of the winding groove 612, an LMD (Laser Metal Deposition) method is used. In the LMD method, the laser device 8 irradiates a base material to be processed, that is, an inner wall surface 613 of the winding groove 612, with a laser beam having a wavelength of about 1000 nm and an extremely high energy density. The portion irradiated with the laser beam on the inner wall surface 613 of the winding groove 612 is instantaneously melted by the laser beam. A welding material such as metal powder and metal wire compatible with the inner wall surface 613 of the winding groove 612 is supplied from the supply device 9 to the molten pool on the inner wall surface 613 of the winding groove 612. As a result, the weld bead is placed on the inner wall surface 613 of the winding groove 612.

In the metal layer forming step of the inner wall surface 613 of the winding groove 612 by the LMD method, a high-pressure inert gas is injected into the portion of the inner wall surface 613 of the winding groove 612 that is irradiated with the laser beam. Examples of the inert gas include argon. By injecting the high-pressure inert gas into the winding groove 612, the molten pool is protected until the molten pool formed on the inner wall surface 613 of the winding groove 612 is cooled and solidified. Thereby, the oxidation reaction of the weld bead is suppressed. When powdered metal is injected as the welding material, the sheave body 611 and the supply device 9 are stored in a chamber (not shown), and the chamber is filled with an inert gas. Thereby, the flow of the inert gas that suppresses the oxidation reaction of the weld bead and the flow of the powdered metal are prevented from colliding with each other.

The weld bead formed per laser pass has a width dimension of about 1 mm to 3 mm and a height dimension of about 1 mm. When the metal layer 614 is formed on the inner wall surface 613 of the winding groove 612 in which the wire rope 3 having a diameter of several centimeters is fitted, the laser path is scanned a plurality of times.

In this example, a fiber laser device having a wavelength of about 1000 nm is used as the laser device. When a solid laser device is used as the laser device, the width dimension of the weld bead can be expanded to about several tens of millimeters.

In the surface shape of the high-hardness metal layer 614 formed by the LMD method, undulations and irregularities are generated as in the surface shape of a general weld bead. Therefore, the wire rope 3 cannot come into surface contact with the high-hardness metal layer 614 formed by the LMD method. Therefore, after the metal layer 614 with high hardness is formed by the LMD method, it is necessary to finish the surface of the metal layer 614 with high hardness by cutting machining. By cutting machining, the undulation of the high-hardness metal layer 614 is reduced, and the surface roughness of the high-hardness metal layer 614 is reduced.

Next, a method for manufacturing the elevator sheave 61 will be described. FIG. 5 is a flowchart showing a method of manufacturing the elevator sheave 61 of FIG. First, in step S101, a gravity casting process is performed. In the gravity casting process, the sheave body 611 is formed by a gravity casting method.

After the gravity casting process, a sheave main body finishing process is performed in step S102. In the sheave main body finishing process, cutting machining of the inner wall surface 613 of the winding groove 612 is performed. The sheave body forming process is composed of the gravity casting process and the sheave body finishing process.

After the sheave main body finishing process, a metal layer forming process is performed in step S103. In the metal layer forming step, the metal layer 614 is formed on the inner wall surface 613 of the winding groove 612 by the LMD method.

After the metal layer forming process, a metal layer finishing process is performed in step S104. In the metal layer finishing process, cutting machining of the contact surface 615 in the metal layer 614 is performed. The manufacturing procedure of the elevator sheave 61 is thus completed.

As described above, according to the elevator sheave 61 according to the first embodiment of the present invention, the inner wall surface 613 of the winding groove 612 of the sheave body 611 has a hardness higher than the hardness of the sheave body 611. The metal layer 614 is provided. Thereby, the abrasion which generate | occur | produces in the winding groove | channel 612 of the elevator sheave 61 can be reduced. By improving the wear resistance of the plurality of winding grooves 612 that wear unevenly, the frequency of reworking the winding grooves 612 in the maintenance of the elevator apparatus can be reduced. As a result, it is possible to reduce the stop time of the elevator apparatus due to maintenance.

Further, according to the method of manufacturing the elevator sheave 61 according to the first embodiment of the present invention, the inner wall surface 613 of the groove of the sheave body 611 has a higher hardness than the sheave body 611 in the metal layer forming step. A high hardness metal layer 614 is provided. Thereby, the abrasion which generate | occur | produces in the winding groove | channel 612 of the elevator sheave 61 can be reduced.

Further, in the method of manufacturing the elevator sheave 61, the metal layer 614 is formed by the Laser Metal Deposition method in the metal layer forming step. Thereby, the metal layer 614 can be easily formed on the inner wall surface 613 of the winding groove 612.

The manufacturing method of the elevator sheave 61 further includes a metal layer finishing step of cutting the surface of the metal layer 614 after the metal layer forming step. Thereby, the contact surface 615 of the metal layer 614 and the wire rope 3 can be more reliably brought into surface contact.

Embodiment 2. FIG.
FIG. 6 is a cross-sectional view showing a main part of an elevator sheave according to Embodiment 2 of the present invention. The metal layer 614 of the elevator sheave 61 according to the second embodiment includes a metal layer body 616 that serves as a welding material for the inner wall surface 613 of the winding groove 612, and a plurality of wear-resistant layers provided inside the metal layer body 616. Particles 617. The metal layer 614 is a metal composite structure.

The metal layer body 616 is made of a metal that is compatible with the sheave body 611 when a weld bead is formed in the LMD method. The metal layer body 616 is made of a metal having the same composition as the sheave body 611. The metal layer body 616 is made of a metal having a linear expansion coefficient similar to that of the sheave body 611.

The hardness of the wear resistant particles 617 is higher than the hardness of the sheave body 611. Thereby, the hardness of the metal layer 614 becomes higher than the hardness of the sheave body 611. When a weld bead is formed in the LMD method, powdered wear-resistant particles 617 are supplied. Further, when a weld bead is formed in the LMD method, a multilayered weld bead is formed. The density of the wear-resistant particles 617 in the metal layer 614 is uniform in the thickness direction of the metal layer 614. Other configurations are the same as those in the first embodiment.

In the first embodiment, a metal having high hardness is used as a welding material for the inner wall surface 613 of the winding groove 612. Therefore, in Embodiment 1, there are limitations on the type of metal used and the function of the metal. On the other hand, in the second embodiment, a metal that is compatible with the sheave body 611 is used as the metal layer body 616, and metal particles that are not compatible with the sheave body 611 are used as the wear-resistant particles 617. . Thereby, the further wear resistance improvement of the elevator sheave 61 can be aimed at.

As described above, according to the elevator sheave 61 according to the second embodiment of the present invention, the metal layer 614 includes the metal layer body 616 that serves as a welding material for the inner wall surface 613 of the winding groove 612, and the metal layer. A plurality of wear-resistant particles 617 having a hardness higher than that of the sheave main body 611 are provided inside the main body 616. Thereby, the further wear resistance improvement of the elevator sheave 61 can be aimed at.

Further, the density of the wear-resistant particles 617 is uniform. Thereby, even if it is a case where abrasion generate | occur | produces in the metal layer 614, the fall of the abrasion resistance of the metal layer 614 can be suppressed.

In addition, according to the method of manufacturing elevator sheave 61 according to Embodiment 2 of the present invention, in the metal layer forming step, metal layer body 616 that serves as a welding material for inner wall surface 613 of winding groove 612, and metal layer A metal layer 614 provided inside the main body 616 and having a plurality of wear-resistant particles 617 having a hardness higher than that of the sheave main body 611 is formed. Thereby, the further wear resistance improvement of the elevator sheave 61 can be aimed at.

Further, according to the method of manufacturing the elevator sheave 61 according to the second embodiment of the present invention, the density of the wear-resistant particles 617 is made uniform in the metal layer forming step. Thereby, even if it is a case where abrasion generate | occur | produces in the metal layer 614, the fall of the abrasion resistance of the metal layer 614 can be suppressed.

Embodiment 3 FIG.
FIG. 7 is a cross-sectional view showing the main parts of an elevator sheave according to Embodiment 3 of the present invention. In the elevator sheave 61 according to the third embodiment, the density of the wear-resistant particles 617 increases from the inner wall surface 613 of the winding groove 612 toward the contact surface 615 that contacts the wire rope 3 in the metal layer 614.

When the weld bead is formed in the LMD method, the amount of the high-hardness wear-resistant particles 617 is gradually increased as the distance from the inner wall surface 613 of the winding groove 612 increases. Thereby, the amount of the wear-resistant particles 617 in the portion close to the inner wall surface 613 of the winding groove 612 in the metal layer 614 can be reduced. Other configurations are the same as those of the second embodiment.

As described above, according to the elevator sheave 61 according to the third embodiment of the present invention, the density of the wear-resistant particles 617 is in contact with the wire rope 3 in the metal layer 614 from the inner wall surface 613 of the winding groove 612. It becomes higher as it goes to the contact surface 615. As a result, the wear resistance of the metal layer 614 can be maintained, and the amount of wear-resistant particles 617 contained in the metal layer 614 can be reduced.

Further, according to the method of manufacturing elevator sheave 61 according to Embodiment 3 of the present invention, in the metal layer forming step, the density of the wear-resistant particles 617 is changed from the inner wall surface 613 of the winding groove 612 to the metal layer 614. The height is increased toward the contact surface 615 in contact with the wire rope 3. Thereby, the amount of the wear-resistant particles 617 included in the metal layer 614 can be reduced.

Embodiment 4 FIG.
FIG. 8 is a cross-sectional view showing a main part of an elevator sheave according to Embodiment 4 of the present invention. In the elevator sheave 61 according to the fourth embodiment, the metal layer 614 includes a first weld metal and a second weld metal having a hardness higher than that of the sheave body 611. The first weld metal is made of a metal that is compatible with the sheave body 611 when a weld bead is formed in the LMD method. The first weld metal is made of a metal having the same composition as that of the sheave main body 611. Further, the first weld metal is made of a metal having a linear expansion coefficient similar to that of the sheave body 611.

The second weld metal is made of a metal that is compatible with the first weld metal when the weld bead is formed in the LMD method. The second weld metal has a hardness higher than that of the first weld metal. The ratio of the second weld metal to the first weld metal in the metal layer 614 increases from the inner wall surface 613 of the winding groove 612 toward the contact surface 615 in contact with the wire rope 3 in the metal layer 614.

The function of improving wear resistance is performed by the second weld metal, and the first weld metal serves as a buffer layer between the inner wall surface 613 of the winding groove 612 and the second weld metal. It is possible to suppress the occurrence of defects that are weld cracks when forming the weld bead. Other configurations are the same as those of the second embodiment.

As described above, according to the elevator sheave 61 according to the fourth embodiment of the present invention, the ratio of the second weld metal to the first weld metal in the metal layer 614 is determined from the inner wall surface 613 of the winding groove 612. It becomes high as it goes to the contact surface 615 in contact with the wire rope 3 in the metal layer 614. Thereby, generation | occurrence | production of the defect which is a weld crack can be suppressed at the time of formation of a weld bead.

Moreover, according to the method of manufacturing elevator sheave 61 according to Embodiment 4 of the present invention, in the metal layer forming step, the ratio of the second weld metal to the first weld metal in metal layer 614 is the winding groove 612. The height is increased from the inner wall surface 613 toward the contact surface 615 in contact with the wire rope 3 in the metal layer 614. Thereby, generation | occurrence | production of the defect which is a weld crack can be suppressed at the time of formation of a weld bead.

Embodiment 5 FIG.
FIG. 9 is a cross-sectional view showing the main parts of an elevator sheave according to Embodiment 5 of the present invention. In the elevator sheave 61 according to the fifth embodiment, the metal layer 614 includes a first weld metal layer piece 618 made of the first weld metal and a second weld metal layer piece 619 made of the second weld metal. And has. The first weld metal layer piece 618 is disposed so as to overlap the inner wall surface 613 of the winding groove 612. The second weld metal layer piece 619 is disposed so as to overlap the first weld metal layer piece 618.

The hardness of the second weld metal layer piece 619 is higher than the hardness of the first weld metal layer piece 618. In addition, the hardness of the second weld metal layer piece 619 is higher than the hardness of the sheave body 611. In the LMD method, the second weld metal layer piece 619 is formed after the first weld metal layer piece 618 is formed. Other configurations are the same as those in the fourth embodiment.

As described above, according to the elevator sheave 61 according to the fifth embodiment of the present invention, the metal layer 614 is provided so as to overlap the inner wall surface 613 of the winding groove 612 and is composed of the first weld metal. The first weld metal layer piece 618 and the second weld metal layer piece 619 that is provided so as to overlap the first weld metal layer piece 618 and is made of the second weld metal. Thereby, generation | occurrence | production of the defect which is a weld crack can be suppressed at the time of formation of a weld bead.

Further, according to the method of manufacturing the elevator sheave 61 according to the fifth embodiment of the present invention, in the metal layer forming step, the first weld metal layer piece 618 composed of the first weld metal is formed in the winding groove 612. A second weld metal layer piece 619 formed to overlap the inner wall surface 613 and made of the second weld metal is formed to overlap the first weld metal layer piece 618. Thereby, generation | occurrence | production of the defect which is a weld crack can be suppressed at the time of formation of a weld bead.

Embodiment 6 FIG.
FIG. 10 is a sectional view showing an essential part of an elevator sheave according to Embodiment 6 of the present invention. In the elevator sheave 61 according to the sixth embodiment, irregularities 620 are formed on the inner wall surface 613 of the winding groove 612. The amplitude of the unevenness 620 is about 1 mm to 5 mm. By forming the unevenness 620 on the inner wall surface 613, the contact area between the inner wall surface 613 and the metal layer 614 increases. The unevenness 620 suppresses peeling of the metal layer 614 from the inner wall surface 613.

The unevenness 620 is formed in the gravity casting process. Specifically, unevenness is formed in a portion corresponding to the unevenness 620 on the surface of the mold on which the sheave main body 611 is formed, and the unevenness 620 is formed simultaneously with the formation of the sheave main body 611 using this mold. . The unevenness 620 may be formed in the cutting machining process after the gravity casting process. In other words, the unevenness 620 is formed in the sheave body forming process.

The metal layer 614 is formed on the unevenness 620 of the inner wall surface 613 of the winding groove 612 using the LMD method in the metal layer forming step. The hardness of the metal layer 614 is higher than the hardness of the sheave body 611. The linear expansion coefficient of the metal layer 614 is different from the linear expansion coefficient of the sheave body 611. Other configurations are the same as those in the first embodiment. Other configurations may be the same as those in any of the second to fifth embodiments.

As described above, according to the elevator sheave 61 according to the sixth embodiment of the present invention, the unevenness 620 is formed on the inner wall surface 613 of the winding groove 612. Thereby, when the metal layer 614 is formed in the LMD method, the occurrence of cracks in the metal layer 614 due to thermal stress is suppressed. Further, when the elevator sheave 61 is used and a temperature change occurs in the elevator sheave 61, the metal layer is caused by the thermal strain generated between the metal layer 614 and the sheave body 611. The occurrence of breakage in 614 is suppressed, and the metal layer 614 is suppressed from peeling from the sheave body 611.

Further, according to the method of manufacturing the elevator sheave 61 according to the sixth embodiment of the present invention, the unevenness 620 is formed on the inner wall surface 613 of the winding groove 612 in the sheave main body forming step. Thereby, when the metal layer 614 is formed in the LMD method, the occurrence of cracks in the metal layer 614 due to thermal stress is suppressed. Further, when the elevator sheave 61 is used and a temperature change occurs in the elevator sheave 61, the metal layer is caused by the thermal strain generated between the metal layer 614 and the sheave body 611. The occurrence of breakage in 614 is suppressed, and the metal layer 614 is suppressed from peeling from the sheave body 611.

Embodiment 7 FIG.
FIG. 11 is a cross-sectional view showing the main parts of an elevator sheave according to Embodiment 7 of the present invention. In the elevator sheave 61 according to the seventh embodiment, the metal layer 614 includes the buffer metal layer piece 621 made of the same metal as the first weld metal of the fifth embodiment and the second weld of the fifth embodiment. And a weld metal layer piece 622 made of the same metal as the metal. The buffer metal layer piece 621 is disposed so as to overlap the inner wall surface 613 of the winding groove 612. The weld metal layer piece 622 is disposed so as to overlap the buffer metal layer piece 621.

The hardness of the weld metal layer piece 622 is higher than the hardness of the buffer metal layer piece 621. Moreover, the hardness of the weld metal layer piece 622 is higher than the hardness of the sheave body 611. Other configurations are the same as those of the fifth embodiment. As in the sixth embodiment, the unevenness 620 may be formed on the inner wall surface 613 of the winding groove 612.

Next, a process of forming the buffer metal layer piece 621 on the inner wall surface 613 of the winding groove 612 will be described. 12 is a cross-sectional view showing a mold on which the sheave body 611 and the buffer metal layer piece 621 of FIG. 11 are formed. FIG. 13 is a cross-sectional view showing a sheave body 611 and a buffer metal layer piece 621 manufactured by the mold of FIG. In the gravity casting process, first, the buffer metal layer piece 621 is installed in a region where the buffer metal layer piece 621 is formed in the mold 10 on which the sheave body 611 and the buffer metal layer piece 621 are formed. Thereafter, the molten alloy is poured into the mold 10. Thereby, the buffer metal layer piece 621 is formed at the same time as the sheave main body 611 is formed. Thereafter, the weld metal layer piece 622 is formed on the buffer metal layer piece 621 by the LMD method. In other words, the metal layer forming step includes a buffer metal layer piece forming step in which the buffer metal layer piece 621 is formed simultaneously with the sheave body 611, and a welding in which the weld metal layer piece 622 is formed after the buffer metal layer piece forming step. A metal layer piece forming step.

As described above, according to the elevator sheave 61 according to the seventh embodiment of the present invention, the metal layer 614 is provided so as to overlap the inner wall surface 613 and is made of the same metal as the first weld metal. It has a buffer metal layer piece 621 and a weld metal layer piece 622 that is provided so as to overlap the buffer metal layer piece 621 and is made of the same metal as the second weld metal. Thereby, when the weld metal layer piece 622 is formed in the LMD method, the weld metal layer piece 622 is prevented from being cracked by thermal stress. Further, when the elevator sheave 61 is used and a temperature change occurs in the elevator sheave 61, it is caused by thermal strain generated between the weld metal layer piece 622 and the buffer metal layer piece 621. The occurrence of breakage in the weld metal layer piece 622 is suppressed, and the weld metal layer piece 622 is prevented from peeling from the buffer metal layer piece 621.

Further, according to the method of manufacturing the elevator sheave 61 according to the seventh embodiment of the present invention, the buffer metal layer piece 621 overlaps the inner wall surface 613 of the winding groove 612 at the same time as the sheave main body 611 is formed. The weld metal layer piece 622 is formed so as to overlap the buffer metal layer piece 621. Thereby, when the weld metal layer piece 622 is formed in the LMD method, the weld metal layer piece 622 is prevented from being cracked by thermal stress. Further, when the elevator sheave 61 is used and a temperature change occurs in the elevator sheave 61, it is caused by thermal strain generated between the weld metal layer piece 622 and the buffer metal layer piece 621. The occurrence of breakage in the weld metal layer piece 622 is suppressed, and the weld metal layer piece 622 is prevented from peeling from the buffer metal layer piece 621.

Embodiment 8 FIG.
FIG. 14 is a sectional view showing a main part of an elevator sheave according to the eighth embodiment of the present invention. In the elevator sheave 61 according to the eighth embodiment, the sheave body 611 includes an inner wall surface portion 623 in which the inner wall surface 613 of the winding groove 612 is formed, and a sheave formed integrally with the inner wall surface portion 623. A main body inner portion 624. The sheave main body inner portion 624 is disposed on the inner side in the radial direction of the sheave main body 611 than the inner wall surface portion 623.

The inner wall surface portion 623 is composed of a material constituting the sheave main body inner portion 624 and a buffer metal that is compatible with the material and is the same metal as the first weld metal of the fifth embodiment. Yes. The inner wall surface portion 623 is modified with respect to the sheave main body inner portion 624. Metal layer 614 is made of the same metal as the second weld metal of the fifth embodiment.

FIG. 15 is a cross-sectional view showing a mold on which the sheave body 611 of FIG. 14 is formed. FIG. 16 is a cross-sectional view showing a sheave body 611 manufactured by the mold of FIG. A part of the surface of the mold 10 on which the cast sheave main body 611 is formed is manufactured by metal three-dimensional modeling such as powder DED (Direct Energy Deposition), wire DED or the like.

In the gravity casting process, a powdered buffer metal 625 is installed in a region of the mold 10 where the sheave body 611 is formed. Thereafter, the molten alloy is poured into the mold 10. Thereby, the inner wall surface part 623 in the sheave main body 611 becomes a reforming region. Thereafter, the metal layer 614 is formed by the LMD method. Other configurations are the same as those of the seventh embodiment.

As described above, according to the elevator sheave 61 according to the eighth embodiment of the present invention, the sheave body 611 includes the inner wall surface portion 623 in which the inner wall surface 613 of the winding groove 612 is formed, and the inner wall surface. A sheave body inner portion 624 formed integrally with the portion 623 is included. The inner wall surface portion 623 is made of a material constituting the sheave main body inner portion 624 and a metal compatible with the material. Thereby, when the metal layer 614 is formed in the LMD method, the occurrence of cracks in the metal layer 614 due to thermal stress is suppressed. Further, when the elevator sheave 61 is used and a temperature change occurs in the elevator sheave 61, the metal layer is caused by the thermal strain generated between the metal layer 614 and the sheave body 611. The occurrence of breakage in 614 is suppressed, and the metal layer 614 is suppressed from peeling from the sheave body 611.

Further, according to the method of manufacturing the elevator sheave 61 according to the eighth embodiment of the present invention, the inner wall surface portion 623 and the sheave body inner portion 624 are formed in the sheave body forming step. The inner wall surface portion 623 is made of a material constituting the sheave main body inner portion 624 and a metal compatible with the material. Thereby, when the metal layer 614 is formed in the LMD method, the occurrence of cracks in the metal layer 614 due to thermal stress is suppressed. Further, when the elevator sheave 61 is used and a temperature change occurs in the elevator sheave 61, the metal layer is caused by the thermal strain generated between the metal layer 614 and the sheave body 611. The occurrence of breakage in 614 is suppressed, and the metal layer 614 is suppressed from peeling from the sheave body 611.

1 hoistway, 2 cabs, 3 wire ropes, 4 counterweights, 5 machine rooms, 6 elevator hoisting machines, 7 pulleys, 8 laser units, 9 supply units, 61 elevator sheaves, 62 motors, 63 housings, 611 Sheave body, 612 winding groove, 613 inner wall surface, 614 metal layer, 615 contact surface, 616 metal layer body, 617 wear-resistant particles, 618 first weld metal layer piece, 619 second weld metal layer piece, 620 unevenness, 621 buffer metal layer piece, 622 weld metal layer piece, 623 inner wall surface part, 624 sheave body inner part, 625 buffer metal.

Claims (19)

A cylindrical sheave body in which a winding groove extending in the circumferential direction is formed on the outer peripheral surface, and a suspended body is fitted in the winding groove;
A metal layer provided on the inner wall surface of the winding groove and in contact with the suspended body;
The elevator sheave is higher in hardness than the sheave body. The metal layer includes a metal layer main body serving as a welding material for the inner wall surface of the winding groove, and a plurality of wear-resistant particles provided inside the metal layer main body and having a hardness higher than the hardness of the sheave main body. The elevator sheave according to claim 1. The elevator sheave according to claim 2, wherein the density of the wear-resistant particles is uniform. The elevator sheave according to claim 2, wherein the density of the wear-resistant particles increases from an inner wall surface of the winding groove toward a contact surface in contact with the suspended body in the metal layer. The metal layer is composed of a first weld metal that is compatible with the inner wall surface of the winding groove and a second weld metal having a hardness higher than the hardness of the sheave body,
2. The ratio of the second weld metal to the first weld metal in the metal layer increases from an inner wall surface of the winding groove toward a contact surface in contact with the suspended body in the metal layer. The elevator sheave described in 1. The metal layer is provided so as to overlap the inner wall surface of the winding groove, and includes a first weld metal layer piece made of a first weld metal that is compatible with the inner wall surface of the winding groove; The elevator welder according to claim 1, further comprising: a second weld metal layer piece that is provided to overlap the one weld metal layer piece and is made of a second weld metal having a hardness higher than that of the sheave body. Sheaves. The sheave body has an inner wall surface portion on which an inner wall surface of the winding groove is formed, and a sheave body inner portion formed integrally with the inner wall surface portion,
The inner wall surface portion is composed of a material constituting the inner portion of the sheave body, and a metal compatible with the material,
The elevator sheave according to claim 1, wherein the metal layer is made of a metal having a hardness higher than that of the inner portion of the sheave body. The elevator sheave according to any one of claims 1 to 7, wherein irregularities are formed on an inner wall surface of the winding groove. A sheave body forming step in which a cylindrical sheave body in which a winding groove extending in the circumferential direction is formed on the outer peripheral surface is formed;
A method of manufacturing an elevator sheave, comprising: a metal layer forming step in which a hardness of the sheave body is higher than a hardness of the sheave body and a metal layer in contact with a suspended body is formed on an inner wall surface of the winding groove. The method of manufacturing an elevator sheave according to claim 9, wherein, in the metal layer forming step, the metal layer is formed by a Laser Metal Deposition method. In the metal layer forming step, a metal layer body serving as a welding material for the inner wall surface of the winding groove, and a plurality of wear-resistant particles provided inside the metal layer body and having a hardness higher than the hardness of the sheave body The method of manufacturing an elevator sheave according to claim 9 or 10, wherein the metal layer having the following is formed. The method for manufacturing an elevator sheave according to claim 11, wherein in the metal layer forming step, the density of the wear-resistant particles is made uniform inside the metal layer. 12. The elevator rope according to claim 11, wherein in the metal layer forming step, the density of the wear-resistant particles is increased from an inner wall surface of the winding groove toward a contact surface in contact with the suspended body in the metal layer. Car manufacturing method. The metal layer is composed of a first weld metal that is compatible with the inner wall surface of the winding groove and a second weld metal having a hardness higher than the hardness of the sheave body,
In the metal layer forming step, the ratio of the second weld metal to the first weld metal in the metal layer is directed from the inner wall surface of the winding groove toward the contact surface in contact with the suspended body in the metal layer. The method for manufacturing an elevator sheave according to claim 9 or 10, wherein the elevator sheave is raised. In the metal layer forming step, a first weld metal layer piece composed of a first weld metal having compatibility with the inner wall surface of the winding groove is formed on the inner wall surface of the winding groove, The elevator welder according to claim 9 or 10, wherein a second weld metal layer piece composed of a second weld metal having a hardness higher than that of the sheave body is formed so as to overlap the first weld metal layer piece. A method of manufacturing a sheave. The metal layer includes a buffer metal layer piece made of a metal compatible with an inner wall surface of the winding groove, and a weld metal layer piece made of a metal having a hardness higher than the hardness of the sheave body. And consists of
The buffer metal layer piece is formed on the inner wall surface of the winding groove at the same time as the sheave body is formed,
The method of manufacturing an elevator sheave according to claim 9 or 10, wherein the weld metal layer piece is formed so as to overlap the buffer metal layer piece. In the sheave body forming step, an inner wall surface portion in which an inner wall surface of the winding groove is formed, and a sheave body inner portion formed integrally with the inner wall surface portion are formed,
The inner wall surface portion is composed of a material constituting the inner portion of the sheave body, and a metal compatible with the material,
The method for manufacturing an elevator sheave according to claim 9 or 10, wherein the metal layer is made of a metal having a hardness higher than that of the inner portion of the sheave body. The method of manufacturing an elevator sheave according to any one of claims 9 to 17, wherein in the sheave body forming step, irregularities are formed on an inner wall surface of the winding groove. The method for manufacturing an elevator sheave according to any one of claims 9 to 18, further comprising a metal layer finishing step of cutting a surface of the metal layer after the metal layer forming step.

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