JP6391509B2 - Sheave and its manufacturing method - Google Patents

Description

  The present invention relates to a metal sheave provided with a bifurcated rim having a wire winding groove on the outer periphery and a method for manufacturing the same.

  The applicant of the present application has applied for a metal sheave as shown in Patent Document 1, for example. This sheave has a structure in which a bifurcated rim having a wire winding groove is provided on the outer periphery of an annular plate.

  The applicant of the present application has applied for a method for manufacturing a sheave as shown in Patent Document 2, for example. In this manufacturing method, a metal annular plate as a base material of the sheave is clamped and held from both sides in the thickness direction with a mold clamping member, and while rotating the annular plate around its center line in a cold state, After tearing the center by pressing the tear roller against the thickness direction center of the outer peripheral surface of the annular plate, the figure roller is pressed against the tearing portion of the rotating annular plate and the shape roller is In this configuration, the bifurcated rim is plastically deformed while expanding the depth and width of the cleaved portion by being displaced toward the center side of the annular plate.

Utility Model Registration No. 3115769 JP 2000-117378 A

  It can be said that the sheave manufactured by the manufacturing method as shown in Patent Document 2 is excellent in wear resistance because the inner surface of the wire winding groove is relatively smooth and hard. On the other hand, the applicant of the present application has come up with the present invention as a result of earnest research to further improve the wear resistance of the inner surface of the wire winding groove.

  In view of such circumstances, an object of the present invention is to provide a sheave that has improved the wear resistance of the wire winding groove as much as possible. Another object of the present invention is to provide a method capable of producing a sheave having a wire winding groove with improved wear resistance as much as possible at a relatively low cost.

The present invention is a metal sheave provided with a bifurcated rim having a wire winding groove on the outer periphery, and a powder made of an inorganic substance is mixed in a surface layer of an inner surface of the wire winding groove, and the powder Is characterized in that it is formed into a film by being densely mixed in the surface layer on the inner surface of the wire winding groove .

  In this configuration, the inner surface of the wire winding groove becomes smooth and hard due to the powder mixed in the surface layer.

  Thus, when a metal wire is wound around the wire winding groove and the sheave is rotated by the wire, the wire is less likely to bite into the inner surface of the wire winding groove. The wear resistance of the inner surface of the groove is improved as much as possible.

Moreover, in the above arrangement of the present invention, the powder, and a film shape by Rukoto closely mix in the surface layer of the inner surface of the wire winding groove.

  In this configuration, since the inner surface of the wire winding groove becomes smoother and harder, it is possible to contribute to improving the wear resistance of the inner surface of the wire winding groove.

  The sheave is preferably a cold forged product of an aluminum alloy, and the powder is preferably a ceramic.

  With this configuration, it becomes clear that the wear resistance of the inner surface of the wire winding groove of the sheave is improved while reducing the weight of the sheave.

  A sheave manufacturing method according to the present invention is a method of manufacturing a sheave having the above-described configuration, in which a metal annular plate as a base material of the sheave is clamped and held from both sides in the thickness direction by a mold clamping member. A second step of creating a circumferential groove by pressing the first pressure roller against the thickness direction center of the outer peripheral surface of the annular plate while rotating the annular plate around its center line in a cold state; By pressing the second pressure roller against the circumferential groove of the rotating annular plate and displacing the second pressure roller toward the center side of the annular plate, the groove depth and groove width of the circumferential groove A third step of plastically deforming so as to form the bifurcated rim while enlarging the width, and in the third step, the circumferential groove of the rotating annular plate is more than the pressing portion of the second pressure roller. Upstream side of the rotation direction Supplying the powder is characterized by.

  Such a form in which the metal annular plate is plastically deformed in the cold state is called “cold forging”. Further, the circumferential groove finally becomes the wire winding groove.

  In the above configuration, the plastic deformation region, the second pressure roller, and the surface layer of the inner surface of the circumferential groove are plastically deformed by the pressure of the second pressure roller against the circumferential groove in the third step. The powder supplied during this period is bitten into the surface layer of the plastic deformation region.

  As a result, the powder is mixed in the surface layer on the inner surface of the circumferential groove whose groove depth and groove width are expanded, that is, the wire winding groove, and the surface layer becomes smooth and hard.

  In addition, in the manufacturing method described above, in the process of plastically deforming the metal annular plate serving as the base material of the sheave by cold forging, only the operation of supplying powder to the plastically deformed portion is performed. It is possible to suppress an increase in manufacturing cost, for example, there is no need to increase the number of processes.

  INDUSTRIAL APPLICABILITY The present invention can provide a sheave in which the wear resistance of the wire winding groove is improved as much as possible.

  In addition, the present invention can provide a method capable of manufacturing a sheave having the wear resistance of the wire winding groove improved as much as possible at a relatively low cost.

It is side view which made the upper half the cross section in one Embodiment of the sheave which concerns on this invention. It is a top view which shows the manufacturing apparatus used for manufacture of the sheave of FIG. FIG. 3 is a cross-sectional view taken along line (3)-(3) in FIG. 2. It is a figure for demonstrating the initial stage when processing the base material of a sheave with the manufacturing apparatus of FIG. FIG. 5 is a diagram for explaining the continuation of FIG. 4. It is a figure for demonstrating the work process in FIG.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  1 to 6 show an embodiment of the present invention. In the figure, 1 indicates the whole sheave.

  The sheave 1 has a structure in which a bifurcated rim 3 having a substantially V-shaped cross section is provided on the outer periphery of a body 2 made of a metal annular plate.

  A separate boss 4 is fitted into the center hole 2a of the body 2 made of the annular plate and fixed by, for example, welding. A wire winding groove 3 a is provided on the outer periphery of the bifurcated rim 3. For example, a metal wire 10 is wound around the wire winding groove 3a when the sheave 1 is used.

  The material of the sheave 1 is, for example, a metal material such as iron-based metal or aluminum alloy, and is manufactured by cold forging described below. Therefore, the inner surface of the wire winding groove 3a of the bifurcated rim 3 of the sheave 1 is smooth. Although it is hard, in this embodiment, it is devised to further improve the wear resistance of the inner surface of the wire winding groove 3a. As will be described in detail later, this contrivance is performed by mixing powder 5 made of an inorganic substance in the surface layer of the inner surface of the wire winding groove 3a of the bifurcated rim 3.

  In such a sheave 1, the inner surface of the wire winding groove 3a becomes smooth and hard due to the powder 5 mixed in the surface layer. Thus, when the metal wire 10 is wound around the wire winding groove 3a and the sheave 1 is rotated by the wire 10, the wire 10 is less likely to bite into the inner surface of the wire winding groove 3a. The wear resistance of the inner surface of the winding groove 3a is improved.

  Next, an example of the manufacturing apparatus 20 used for manufacturing the sheave 1 will be described with reference to FIGS.

  The manufacturing apparatus 20 includes first and second mandrels 21 and 22 as mold clamping members, a rotation driving device 23, a linear driving device 24, a first pressurizing device 25, a second pressurizing device 26, a control device 27, and the like. ing.

  The first and second mandrels 21 and 22 hold and hold a metal annular plate as a sheave base material from both sides in the thickness direction, both of which are disk-shaped and have an outer diameter. Are set almost the same.

  The first mandrel 21 is supported by the rotational drive device 23, and the second mandrel 22 is supported by the linear drive device 24.

  As shown in FIGS. 4 and 5, a convex shaft portion 21a for supporting the base material (work) 1a of the sheave 1 is provided at the center portion of the outer surface of the first mandrel 21, and this first mandrel is provided. A molding surface 21 b for molding one outer surface of the bifurcated rim 3 of the sheave 1 is provided on the outer peripheral edge of the outer surface 21.

  As shown in FIGS. 4 and 5, a depressed portion 22 a is provided at the center portion of the outer surface of the second mandrel 22, and the bifurcated rim 3 of the sheave 1 is disposed on the outer peripheral edge of the outer surface of the second mandrel 22. A molding surface 22b is provided for molding the other outer surface. The depressed portion 22a is provided as a relief in which the convex shaft portion 21a of the first mandrel 21 enters non-contact during processing.

  The rotation drive device 23 includes a fixed frame 23a, a spindle 23b, a clamp 23c, a motor 23d, and the like.

  The fixed frame 23a is fixed to the other end in the longitudinal direction of a pair of tie rods 24a and 24b of the linear drive device 24 described below. The spindle 23b is rotationally driven by a motor 23d, and is rotatably supported by the fixed frame 23a. A clamp 23c is coaxially fixed to the tip of the spindle 23b, and the first mandrel 21 is fixed to the tip of the clamp 23c.

  The linear drive device 24 includes a pair of tie rods 24a and 24b, a fixed frame 24c, a moving frame 24d, a clamp 24e, an actuator 24f, and the like.

  A fixed frame 24c is fixed to one end in the longitudinal direction of the pair of tie rods 24a, 24b, and a moving frame 24d is attached to the middle of the pair of tie rods 24a, 24b so as to be reciprocally displaceable in the longitudinal direction of the tie rods 24a, 24b. A clamp 24e is rotatably supported on the frame 24d, and the second mandrel 22 is fixed to the tip of the clamp 24e.

  The actuator 24f linearly reciprocates the moving frame 24d, and is, for example, a hydraulic cylinder. The actuator 24f includes a cylinder tube 24g fixed to the fixed frame 24c and a piston rod 24h fixed to the moving frame 24d.

  The first pressure device 25 includes a first pressure roller 25a, an actuator 25b, and the like. As shown in FIG. 3, the first pressure roller 25 a is disposed so as to be adjacent in the horizontal direction with respect to the annular plate serving as the base material 1 a of the sheave 1.

  The actuator 25b linearly reciprocates the first pressure roller 25a, and is, for example, a hydraulic cylinder. The actuator 25b includes a cylinder tube 25c and a piston rod 25d. The cylinder tube 25c is fixed to a fixed base (not shown), and a first pressure roller 25a is rotatably supported at the tip of the piston rod 25d via an arm 25e. In other words, the actuator 25b moves the first pressure roller 25a toward or away from the base material 1a of the sheave 1 when the sheave 1 is manufactured.

  The second pressure device 26 includes a second pressure roller 26a, an actuator 26b, and the like. As shown in FIG. 3, the second pressure roller 26 a is disposed so as to be adjacent in the horizontal direction to the annular plate serving as the base material 1 a of the sheave 1. Thereby, the 1st pressurization roller 25a and the 2nd pressurization roller 26a are arrange | positioned so that 180 degree | times may be pinched | interposed across the annular plate used as the base material 1a of the sheave 1. FIG.

  The actuator 26b linearly reciprocates the second pressure roller 26a, and is, for example, a hydraulic cylinder. The actuator 26b includes a cylinder tube 26c and a piston rod 26d. The cylinder tube 26c is fixed to a fixed base (not shown), and a second pressure roller 26a is rotatably supported at the tip of the piston rod 26d via an arm 26e. In other words, the actuator 26b moves the second pressure roller 26a toward or away from the base material 1a of the sheave 1 when the sheave 1 is manufactured.

  The control device 27 controls the operation of the motor 23d of the rotary drive device 23, the actuator 24f of the linear drive device 24, the actuator 25b of the first pressure device 25, and the actuator 26b of the second pressure device 26. A program for automatically manufacturing 1 is equipped.

  Next, a method for manufacturing the sheave 1 will be described.

  First, as a first step, the base material 1a of the sheave 1 is clamped and held from both sides in the thickness direction by the first and second mandrels 21 and 22 as clamping members. At this time, after the center hole of the annular plate which is the base material 1a of the sheave 1 is fitted to the convex shaft portion 21a of the first mandrel 21, the second mandrel 22 is moved closer to the first mandrel 21 side by the linear drive device 24. To be linearly displaced. In this way, the linear driving device 24 performs an operation of clamping the base material 1a between the first mandrel 21 and the second mandrel 22 or an operation of releasing the clamping pressure.

  In this way, the control device 27 continuously executes the following second and third steps as the operation switch (not shown) is pushed.

  As a second step, as shown in FIG. 4, while rotating the base material 1a around the center line 100 by the rotary drive device 23 in the cold state, an actuator is provided at the center in the thickness direction of the outer peripheral surface of the base material 1a. The circumferential groove 1b is formed by pressing the first pressure roller 25a with 25b. The circumferential groove 1b is obtained by cleaving the thickness direction center of the outer peripheral surface of the substrate 1a with the first pressure roller 25a. Therefore, the first pressure roller 25a can also be called a tearing roller.

  Thereafter, the third step is performed after the first pressure roller 25a is separated from the substrate 1a by the actuator 25b.

  In this third step, as shown in FIGS. 5 and 6, in the cold state, the second pressure roller 26a is pressed against the circumferential groove 1b of the rotating base material 1a by the actuator 26b and the second pressure is applied. By displacing the pressure roller 26a toward the center of the base material 1a, the fork rim 3 is plastically deformed while expanding the groove depth and groove width of the circumferential groove 1b. The circumferential groove 1b finally becomes the wire winding groove 3a.

  In such a third step, the second pressure roller 26a is in pressure contact with the region which is the inner surface of the bifurcated rim 3 made by plastic flow of the substrate 1a, while it is the outer surface of the bifurcated rim 3. Since the region is pressed against the outer diameter side molding surfaces 21b and 22b of the first and second mandrels 21 and 22, the outer surface of the second pressure roller 26a and the molding surfaces of the first and second mandrels 21 and 22 The bifurcated rim 3 is formed with high accuracy following the shapes of 21b and 22b. Such a form in which the base material 1a made of a metal annular plate is plastically deformed in a cold state is called “cold forging”.

  Further, in the third step, as shown by an arrow 200 in FIG. 6, the circumferential groove 1b of the rotating substrate 1a is cooled to the upstream side in the rotational direction from the pressing portion of the second pressure roller 26a. As shown by an arrow 300 in FIG. 6, the second pressure roller is further upstream of the pressing portion of the second pressure roller 26a and further upstream of the liquid supply position. The powder 5 is supplied to a position close to 26a.

  Thus, the powder supplied between the plastic deformation region and the second pressure roller 26a while the surface layer of the inner surface of the circumferential groove 1b is plastically deformed by the pressure of the second pressure roller 26a against the circumferential groove 1b. 5 is bitten into the surface layer of the plastic deformation region.

  As described above, the powder 5 is mixed in the surface layer on the inner surface of the wire winding groove 3a formed by enlarging the groove depth and the groove width of the circumferential groove 1b, so that the surface layer becomes smooth and hard. . At this time, the powder 5 can be formed into a film by densely mixing the powder 5 in the surface layer on the inner surface of the wire winding groove 3a.

  Compared to the case where the sheave 1 manufactured by such a manufacturing method does not supply the powder 5, the inner surface of the wire winding groove 3a becomes smoother and harder, so the wear resistance of the inner surface of the wire winding groove 3a Is further improved.

  By the way, the base material 1a of the sheave 1 can be made of, for example, an aluminum alloy or an iron-based metal, and the powder 5 can be made of, for example, ceramics, silicon, carbon, or the like. Examples of the ceramic include oxides (for example, alumina, zirconia), carbides (for example, silicon carbide), nitrides (for example, silicon nitride, boron nitride), and barium titanate.

  In this embodiment, the base material 1a of the sheave 1 is an aluminum alloy, and the powder 5 is ceramic. Such a composition is advantageous in practical use since the wear resistance of the inner surface of the wire winding groove 3a of the sheave 1 is improved while reducing the weight of the sheave 1.

  As described above, in the embodiment to which the present invention is applied, the inner surface of the wire winding groove 3a of the sheave 1 can be made smooth and hard by the powder 5 mixed in the surface layer. Thus, when the metal wire 10 is wound around the wire winding groove 3a and the sheave 1 is rotated by the wire 10, the wire 10 is less likely to bite into the inner surface of the wire winding groove 3a. The wear resistance of the inner surface of the winding groove 3a is improved as much as possible.

  Moreover, in the manufacturing method described above, in the process of plastically deforming the metal annular plate serving as the base material 1a of the sheave 1 by cold forging, only the operation of supplying the powder 5 to the plastically deformed portion is performed. It is possible to suppress an increase in manufacturing cost, for example, it is not necessary to increase the number of special processes. Thereby, the sheave 1 can be manufactured at a relatively low cost.

  In addition, this invention is not limited only to the said embodiment, It can change suitably in the range equivalent to the claim and the said range.

  (1) In the above embodiment, the sheave 1 is exemplified by fitting and fixing the boss 4 to the center hole 2a of the body 2. However, the present invention is not limited to this and is not illustrated. For example, the body 2 and the boss 4 can be integrally formed.

  (2) The form and arrangement of the elements constituting the manufacturing apparatus 20 shown in the above embodiment are not particularly limited as long as they are functionally equivalent.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a metal sheave provided with a bifurcated rim having a wire winding groove on the outer periphery and a manufacturing method thereof.

1 sheave
1a Base material
1b Circumferential groove
2 Body
2a Center hole
3 Bifurcated rim
3a Wire winding groove
4 Boss
5 Powder 10 Wire 20 Manufacturing equipment
21 First mandrel
22 Second mandrel
23 Rotation drive
24 Linear drive
25 First pressurizing device
25a First pressure roller
26 Second pressurizing device
26a Second pressure roller
27 Controller 100 Sheave centerline

Claims (3)

A metal sheave provided with a bifurcated rim having a wire winding groove on the outer periphery,
In the surface layer of the inner surface of the wire winding groove is mixed with an inorganic powder ,
The sheave according to claim 1, wherein the powder is formed into a film shape by being densely mixed in a surface layer on an inner surface of the wire winding groove . The sheave according to claim 1, wherein the sheave is a cold forged product of an aluminum alloy, and the powder is ceramic . A method for producing the sheave according to claim 1 or 2, comprising:
A first step of holding and holding a metal annular plate as a base material of the sheave from both sides in the thickness direction with a mold clamping member;
A second step of creating a circumferential groove by pressing the first pressure roller to the center in the thickness direction of the outer peripheral surface of the annular plate while rotating the annular plate around its center line in the cold state;
By pressing the second pressure roller against the circumferential groove of the rotating annular plate and displacing the second pressure roller toward the center side of the annular plate, the groove depth and groove width of the circumferential groove A third step of plastically deforming so as to make the bifurcated rim while expanding
Wherein in the third step, you supply the powder to the direction of rotation upstream of the site pressing of the second pressure roller in the circumferential groove of the annular plate that the rotation, production of the sheave, characterized in that Way .

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