JP2022051602A - Center hole forming device of shaft member and center hole forming method of shaft member - Google Patents

Abstract

To provide a center hole forming device of a shaft member which can inexpensively form a center hole of the shaft member without using dedicated equipment, and a center hole forming method of the shaft member.SOLUTION: A center hole forming device 20 of a shaft member 10 comprises a base 21 on which the shaft member 10 having a center hole at one end part 12 is arranged, a grindstone 26 for forming the center hole of the shaft member 10 which is arranged on the base 21, and a movable sensor for rotating the grindstone 26 around an axial line L2, and moving the grindstone 26 so as to make it close to and away from the center hole of the shaft member 10. The grindstone 26 and the shaft member 10 are arranged in a state where an axial line L2 of the grindstone 26 and an axial line L1 of the shaft member 10 are inclined at certain angles, and the movable center can move the grindstone 26 so that the grindstone 26 and the center hole of the shaft member 10 contact with each other.SELECTED DRAWING: Figure 2

Description

The present invention relates to a center hole shaping machine for a shaft member and a center hole shaping processing method for a shaft member.

Conventionally, a processing device and a processing method for processing a center hole at an end portion of a shaft member have been proposed (see, for example, Patent Document 1).

In Patent Document 1, when a shaft member such as a CVT (Continuously Variable Transmission) shaft is manufactured, a center hole is machined (formed) in at least one of one end and the other end of the shaft member in the axial direction. The processing equipment and processing method for this are described.

In Patent Document 1, when a center hole is machined in one end and the other end of the shaft member in the axial direction, one end of the shaft member is cut with an end face cutting tool while the shaft member is held by the chuck. It is described that an end face is formed by cutting with a center hole drill, and a center hole is formed on the end face. Further, Patent Document 1 describes that the other end portion of the shaft member is also subjected to end face cutting and center hole machining in the same manner as the one end portion.

Japanese Unexamined Patent Publication No. 11-226827

Generally, when machining a shaft-shaped part, the shaft portion is machined after the center hole is machined at the end portion. After that, when the heat treatment is performed, the heat treatment strain causes bending of the shaft portion or distortion of the center hole. Since the center hole also serves as a reference for subsequent processing, the center hole may be formed after the heat treatment. Normally, since the peripheral surface portion of the center hole of the shaft member is formed in a tapered shape, a dedicated grindstone having the tapered portion is used at the time of shaping. However, if a special grindstone is used during shaping, the cost is high and the dressing of the special grindstone requires time and effort, so that there is a problem that maintainability is poor.

Further, in order to manufacture a highly accurate shaft member, the accuracy of the center hole as a reference is very important. Therefore, it is conceivable to use a dedicated facility such as a center hole grinding machine for shaping the center hole, but it is expensive and has poor productivity, and is not suitable for mass-produced parts such as automobiles.

The present invention has been made to solve the above-mentioned problems, and is a shaft member center hole shaping processing device and a shaft capable of shaping a shaft member center hole at low cost without using dedicated equipment. It is an object of the present invention to provide a method for shaping a center hole of a member.

In order to achieve the above object, the present invention is configured as follows.

(1) The shaft member center hole shaping processing apparatus according to the present invention shapes an installation portion in which a shaft member having a center hole at an end is installed and a center hole of the shaft member installed in the installation portion. The shaping processing member is provided with a moving device for rotating the shaping processing member around an axis line and moving the shaping processing member so as to move toward and away from the center hole of the shaft member. The member and the shaft member are arranged in a state where the axis of the shaped member and the axis of the shaft member are inclined at a first angle, and the moving device is a center hole of the shaped member and the shaft member. It is characterized in that the shaping member is moved so as to be in contact with the.

According to the above configuration, since the axis of the shaping member is inclined at the first angle with respect to the axis of the shaft member, the center hole of the shaft member is tilted at the first angle with respect to the axis of the shaft member. The center hole of the shaft member can be shaped so as to be. Further, according to the above configuration, the shaping member is moved in the axial direction in the shaping member by the moving device, and the shaping process is performed on the center hole of the shaft member. Therefore, the shaping member and the center hole of the shaft member are separated from each other. It is possible to shape the center hole while making contact with different positions. As a result, it is possible to suppress the wear of the shaped member at a certain position, so that the influence of the wear of the shaped member can be reduced. As described above, according to the above configuration, the center hole of the shaft member can be shaped at low cost without using dedicated equipment.

(2) In the shaft member center hole shaping machine according to the present invention, the shaft member is configured to be rotatable around the axis of the shaft member, and the rotation speed of the shaped member around the axis is the shaft member. It should be larger than the rotation speed around the axis. With this configuration, the rotation speed of the shaping member is higher than the rotation speed of the shaft member, so that the shaping of the center hole of the shaft member can be performed quickly.

(3) In the center hole shaping processing apparatus for a shaft member according to the present invention, it is preferable to further include a holding member that rotatably holds the shaft member around the axis at a predetermined position in the shaft member in the axial direction. With this configuration, the shaft member is stably held by the holding member, so that the shaft member can be rotated while suppressing the shaft runout. Therefore, the shaping process for the center hole of the shaft member can be performed with high accuracy.

(4) In the center hole shaping processing apparatus for a shaft member according to the present invention, the shaping processing member includes the shaft portion and a grindstone portion at the end of the shaft portion, and the grindstone portion is the axis of the shaft portion. It is preferable to form the same diameter along the direction. With this configuration, the grindstone portion of the shaping member can be formed into a rod shape. Therefore, the center hole of the shaft member can be easily formed by simply moving the shaping member in the radial direction with respect to the center hole of the shaft member. Dimensional correction in the radial direction can be performed. Further, since the grindstone portion of the shaping member has a rod shape, the grindstone portion can be easily dressed.

(5) In the center hole shaping processing apparatus for a shaft member according to the present invention, the installation portion on which the shaft member is installed is arranged in a state of being inclined at a second angle with respect to a horizontal plane, and the shaping processing member is It is preferable that the axis of the shaped member is arranged so as to be orthogonal to the horizontal plane. With this configuration, the center hole of the shaft member can be shaped so that the peripheral surface portion constituting the center hole of the shaft member and the axis of the shaft member form a second angle.

(6) In the shaft member center hole shaping processing apparatus according to the present invention, the shaft member center hole has a tapered peripheral surface portion, and the peripheral surface portion of the shaft member center hole is on the shaft line of the shaft member. On the other hand, the first angle formed by the axis of the shaped member and the axis of the shaft member may be larger than the third angle. With this configuration, when shaping is performed in the center hole of the shaft member, the shaping member comes into contact with the peripheral surface of the center hole, so that the peripheral surface of the center hole can be shaped at an arbitrary angle. ..

(7) In the method for shaping a center hole of a shaft member according to the present invention, a shaft member having a center hole at an end is installed in an installation portion, and the shaping member for shaping the center hole is rotated around an axis. A method of shaping a center hole of a shaft member by moving the shaft member so as to be close to and away from the center hole of the shaft member, wherein the axis of the shaped member and the axis of the shaft member are the first. The shaping member and the shaft member are arranged so as to be tilted at an angle, and the shaping member is moved by the moving device so that the shaping member and the center hole of the shaft member are brought into contact with each other. This is characterized by shaping the center hole.

According to the above configuration, since the axis of the shaped member is tilted at the first angle with respect to the axis of the shaft member, the center hole of the shaft member is tilted at the first angle with respect to the axis of the shaft member. The center hole can be shaped so as to be. Further, according to the above configuration, the shaping member is moved in the axial direction in the shaping member by the moving device, and the shaping process is performed on the center hole of the shaft member. Therefore, the shaping member and the center hole of the shaft member are formed. It is processed while contacting different positions. As a result, it is possible to suppress the wear of the shaped member at a certain position, so that the influence of the wear of the shaped member can be reduced. As described above, according to the above configuration, the center hole of the shaft member can be shaped at low cost without using dedicated equipment.

According to the aspect of the present invention, there is provided a shaft member center hole shaping processing device capable of shaping a shaft member center hole at low cost without using dedicated equipment, and a shaft member center hole shaping processing method. can do.

(A) is a diagram for explaining centering in the shaft member according to the present embodiment, and (b) is a diagram for explaining the clamp in the shaft member according to the present embodiment. It is a figure for demonstrating the shaping process in the center hole of a shaft member by this embodiment. It is a figure which shows the state of moving the grindstone by this embodiment close to and away from the center hole of a shaft member. It is a figure which shows the state of shaping the center hole of a shaft member by the grindstone by this embodiment. It is a figure which shows the appearance that the diameter expansion part was formed in the peripheral surface part of the center hole of the shaft member by this embodiment.

Hereinafter, embodiments of the shaft member center hole shaping processing apparatus and the shaft member center hole shaping processing method according to the present invention will be described with reference to the accompanying drawings. These figures are schematic views and do not necessarily show the sizes in accurate ratios. Further, in the figure, similar components are indicated by the same reference numerals.

(Shaft member)
The configuration of the shaft member according to the present embodiment will be described with reference to FIGS. 1 and 3. An example of the shaft member is a CVT (Continuously Variable Transmission) shaft mounted on an automobile.

As shown in FIG. 1, the shaft member 10 includes a shaft portion 11 at the center thereof. On the one end portion 12 side of the shaft portion 11, a disk portion 13 projecting in a collar shape in a direction perpendicular to the axis L1 of the shaft member 10 is provided. A tapered sheave surface 13a is formed on one surface of the disk portion 13. A center hole 14 is formed on one end 12 side of the disk portion 13. Inside the center hole 14, a tapered peripheral surface portion 14a (see FIG. 3) constituting the center hole 14 is formed. A spline portion 16 is formed on the other end portion 15 side of the shaft portion 11. A center hole (not shown) having a tapered peripheral surface portion is formed on the other end portion 15 side of the spline portion 16.

Generally, after the shaft member 10 is machined such as a center hole, it is placed in a heat treatment furnace and subjected to heat treatment such as charcoal burning to increase the hardness of the surface. However, since the shaft member 10 is distorted by heat-treating the shaft member 10, it is necessary to perform shaping (correction) on the peripheral surface portion 14a of the center hole 14 of the shaft member 10. Next, the configuration of the center hole shaping machine 20 for shaping the peripheral surface portion 14a of the center hole 14 of the shaft member 10 will be described.

(Center hole shaping machine)
The configuration of the center hole shaping machine according to the present embodiment will be described with reference to FIGS. 1 and 2. An example of a center hole shaping device is a general machining center or the like.

As shown in FIGS. 1 and 2, the center hole shaping processing apparatus 20 includes a base 21 installed on the ground, a floor, or the like. The base 21 is an example of the "installation unit" of the present invention. Further, the base 21 is installed in a state of being inclined at an angle β (about 30 ° in this embodiment) with respect to the horizontal plane H (installation surface). A positioning portion 22 is provided on the upper surface 21a of the base 21. The positioning portion 22 is provided with a tapered portion 22a that tapers upward. When centering the shaft member 10, the center hole of the other end portion 15 of the shaft member 10 is configured to engage with the tapered portion 22a of the positioning portion 22.

A support column 23 is provided at the end of the base 21. The column 23 is provided so as to extend in a direction orthogonal to the upper surface 21a of the base 21. The column 23 is provided with a movable center 24 via rails, sliders, and the like (not shown). The movable center 24 is an example of the "moving device" of the present invention. Further, the movable center 24 is movable in the vertical direction along the surface of the support column 23 (along the extending direction). Further, the shaft member 10 is configured to be arranged between the movable center 24 and the base 21, and the movable center 24 can be moved so as to be close to and away from the shaft member 10. ing.

The movable center 24 is provided with a positioning portion 25. The positioning portion 25 is provided with a tapered portion 25a that tapers toward the base 21 side. When centering the shaft member 10, the tapered portion 25a of the positioning portion 25 is configured to engage with the center hole 14 of the one end portion 12 of the shaft member 10.

As shown in FIG. 2, the movable center 24 holds a grindstone 26 for shaping the peripheral surface portion 14a of the center hole 14 of the shaft member 10. The grindstone 26 is an example of the "shaping member" of the present invention. The grindstone 26 is arranged so that the axis L2 of the grindstone 26 is orthogonal to the horizontal plane H.

Further, the grindstone 26 includes a grindstone portion 261 and a grindstone portion 262 in which a grindstone (abrasive grain) is provided in a part of the shaft portion 261. The grindstone portion 262 includes a straight portion 262a and a tapered portion 262b. The straight line portion 262a is formed with the same diameter along the axis L2 direction of the grindstone 26.

The grindstone 26 is configured to be movable so as to be close to and away from the peripheral surface portion 14a of the center hole 14 of the shaft portion 261 by the movable center 24. Specifically, the grindstone 26 has a peripheral surface portion of the center hole 14 of the shaft member 10 in a state where the axis L2 of the grindstone 26 and the axis L1 of the shaft member 10 are inclined at an angle α (about 30 ° in this embodiment). It is configured to be close to and away from 14a.

Further, the grindstone 26 is configured to be rotatable around the axis L2. Specifically, the rotation speed of the grindstone 26 around the axis L2 is configured to be higher than the rotation speed of the shaft member 10 described later around the axis L1. Further, when the straight portion 262a of the grindstone portion 262 comes into contact with the peripheral surface portion 14a of the center hole 14 of the shaft member 10 while the grindstone 26 is rotated, the peripheral surface portion 14a of the center hole 14 is ground and shaped. To.

A clamp device 27 is provided between the base 21 and the movable center 24. The clamp device 27 is an example of the "holding member" of the present invention. Further, the clamp device 27 is connected to the support column 23 via a connecting member or the like (not shown). The clamp device 27 is provided to hold and release the shaft member 10 with respect to the base 21 and the support column 23. Further, the clamp device 27 is configured to be rotatable around the axis L1 while holding the shaft member 10. The clamp device 27 may have a configuration in which the shaft member 10 is sandwiched from opposite directions or a cylindrical configuration in which the entire circumference of the shaft member 10 is sandwiched, and the device configuration can be appropriately selected.

(Center hole shaping method)
Next, a center hole shaping method according to the present embodiment will be described with reference to FIGS. 1 to 5. In this embodiment, a shaping method for the peripheral surface portion 14a of the center hole 14 formed in one end portion 12 of the shaft member 10 will be described.

First, as shown in FIG. 1A, a center hole (shown) formed in the other end portion 15 of the shaft member 10 with respect to the tapered portion 22a of the positioning portion 22 provided on the upper surface 21a of the base 21. Z) is installed. As a result, the shaft member 10 is temporarily placed on the base 21. Next, the tapered portion 25a of the positioning portion 25 provided in the movable center 24 is installed in the center hole 14 formed in the one end portion 12 of the shaft member 10. Then, by advancing (pressing) the positioning portion 25 in the movable center 24 with respect to the center hole 14 of the shaft member 10, the shaft member 10 is centered.

Next, as shown in FIG. 1 (b), a predetermined position of the shaft member 10 (in the present embodiment, near the spline portion 16) is held by the clamp device 27. At this time, the shaft member 10 is rotatable around the axis L1 in the shaft member 10 while being held by the clamp device 27.

As shown in FIGS. 2 and 3, in a state where the shaft member 10 is held by the clamp device 27, rotation is started around the axis L1. The rotation direction of the shaft member 10 may be either a clockwise direction or a counterclockwise direction. Next, the grindstone 26 held by the movable center 24 rotates around the axis L2 and approaches the center hole 14 of the shaft member 10. The rotation direction of the grindstone 26 may be either a clockwise direction or a counterclockwise direction, but the rotation direction is appropriately selected depending on the rotation direction of the shaft member 10. Further, the rotation speed of the grindstone 26 around the axis L2 is higher than the rotation speed of the shaft member 10 around the axis L1.

As shown in FIG. 3, the grindstone 26 is close to the center hole 14 of the shaft member 10 in a state where the axis L2 and the axis L1 of the shaft member 10 are inclined at an angle α (about 30 ° in this embodiment). do. At this time, the angle α formed by the axis L1 of the shaft member 10 and the axis L2 of the grindstone 26 is larger than the angle γ formed by the axis L1 of the shaft member 10 and the peripheral surface portion 14a of the center hole 14.

As shown in FIG. 4, the straight portion 262a of the grindstone portion 262 of the grindstone 26 is in contact with the peripheral surface portion 14a of the center hole 14 of the shaft member 10 in a state where the straight portion 262a of the grindstone portion 262 of the grindstone 26 is in contact with the axial line L2. While rotating around, it reciprocates along the axis L2 direction. As a result, as shown in FIG. 5, the peripheral surface portion 14a of the center hole 14 of the shaft member 10 is ground (broken line portion shown in FIG. 5), and the diameter of the peripheral surface portion 14a of the center hole 14 of the shaft member 10 is larger than that of the peripheral surface portion 14a. The diameter portion 14b is formed. Further, the processed surface of the enlarged diameter portion 14b of the center hole 14 is shaped so as to be parallel to the axis L2 of the grindstone 26. As a result, the shaping of the center hole 14 of the shaft member 10 is completed.

According to the embodiment described above, the following effects (1) to (6) can be obtained.

(1) In the center hole shaping processing device for the shaft member and the center hole shaping processing method for the shaft member according to the present embodiment, the axis L1 of the shaft member 10 and the axis line L2 of the grindstone 26 are tilted at an angle α. The shaft member 10 and the grindstone 26 were arranged in the shaft member 10, and the grindstone 26 was moved by the movable center 24 so that the center hole 14 of the shaft member 10 and the grindstone 26 were in contact with each other. According to the above embodiment, since the axis L1 of the shaft member 10 is inclined at an angle α (constant angle) with respect to the axis L2 of the grindstone 26, the peripheral surface portion 14a of the center hole 14 of the shaft member 10 is the shaft member 10. The peripheral surface portion 14a of the center hole 14 of the shaft member 10 can be shaped so that the angle α is inclined with respect to the axis L1 of the shaft member 10. Further, according to the above embodiment, since the center hole 14 of the shaft member 10 is shaped while the grindstone 26 is moved in the axis L2 direction by the movable center 24, the center hole 14 of the shaft member 10 and the grindstone 26 are positioned at different positions. The center hole 14 can be machined while being in contact with the wheel. As a result, the grindstone 26 is prevented from being worn at a certain position, so that the influence of the wear of the grindstone 26 can be reduced. As described above, according to the above embodiment, the peripheral surface portion 14a of the center hole 14 of the shaft member 10 can be shaped at low cost without using dedicated equipment.

(2) In the center hole shaping processing apparatus for the shaft member according to the present embodiment, the rotation speed around the axis L2 in the grindstone 26 is made larger than the rotation speed around the axis L1 in the shaft member 10. As a result, the rotation speed of the grindstone 26 is made larger than the rotation speed of the shaft member 10, so that the center hole 14 of the shaft member 10 can be shaped quickly.

(3) In the center hole shaping processing apparatus for the shaft member according to the present embodiment, the shaft member 10 is rotatably held around the shaft line L1 by the clamp member 27 at a predetermined position in the shaft member 10 in the axis L1 direction. As a result, the shaft member 10 is stably held by the clamp member 27, so that the shaft member 10 can be rotated while suppressing the shaft runout. Therefore, the shaping process for the center hole 14 of the shaft member 10 can be performed with high accuracy.

(4) In the center hole shaping processing apparatus for the shaft member according to the present embodiment, the grindstone portion 262 of the grindstone 26 is formed to have the same diameter along the axis L2 direction. As a result, the grindstone portion 262 of the grindstone 26 can be formed in a rod shape. Therefore, simply by moving the grindstone 26 in the radial direction with respect to the center hole 14 of the shaft member 10, it is possible to easily perform the dimensional correction in the radial direction on the peripheral surface portion 14a of the center hole 14 of the shaft member 10. Further, since the grindstone portion 262 of the grindstone 26 has a rod shape, the grindstone portion 262 can be easily dressed.

(5) In the center hole shaping processing apparatus for the shaft member according to the present embodiment, the base 21 on which the shaft member 10 is installed is arranged in a state of being inclined at an angle β with respect to the horizontal plane H, and the grindstone 26 is arranged along the axis of the grindstone 26. Arranged so as to be orthogonal to the horizontal plane H. As a result, the center hole 14 of the shaft member 10 can be shaped so that the peripheral surface portion 14a constituting the center hole 14 of the shaft member 10 and the axis L1 of the shaft member 10 form an angle β.

(6) In the shaft member center hole shaping processing apparatus according to the present embodiment, the angle α formed by the axis L1 of the shaft member 10 and the axis L2 of the grindstone 26 is the axis L1 of the shaft member 10 and the center hole 14 of the shaft member 10. It was made larger than the angle γ formed by the peripheral surface portion 14a of the above. As a result, when shaping is performed on the peripheral surface portion 14a of the center hole 14 of the shaft member 10, the straight portion 262a of the grindstone portion 262 of the grindstone 26 comes into contact with the peripheral surface portion 14a of the center hole 14, so that the circumference of the center hole 14 is The surface portion 14a can be shaped at any angle.

The above embodiment may have a configuration modified as follows.

In the above embodiment, the CVT shaft is shown as an example of the shaft member, but the present invention is not limited to this. In the present invention, if it is possible to shape the center hole of the shaft member, it can be applied to the crankshaft of an engine and the shaft member used in a general machine.

In the above embodiment, an example is shown in which the axis of the shaft member and the axis of the grindstone are inclined at an angle of about 30 °, but the present invention is not limited to this. In the present invention, it is preferable to set the inclination angle formed by the axis of the shaft member and the axis of the grindstone according to the size of the angle formed by the axis of the shaft member and the peripheral surface portion of the center hole of the shaft member.

In the above embodiment, an example is shown in which the rotation speed around the axis of the grindstone is configured to be larger than the rotation speed of the shaft member around the axis, but the present invention is not limited to this. In the present invention, when the processing speed and processing accuracy of shaping in the center hole of the shaft member are improved, the rotation speed around the axis of the grindstone may be smaller than the rotation speed of the shaft member around the axis. ..

In the above embodiment, an example of holding the vicinity of the spline portion of the shaft member by a clamp device has been shown, but the present invention is not limited to this. In the present invention, if it is possible to stably hold the shaft member during rotation and shaping of the shaft member, it is preferable to hold a portion different from the vicinity of the spline portion by the clamp device.

All of the above embodiments are examples of the indications of the present invention, and it is natural that any other embodiment within the scope of the claims is included in the technical scope of the invention.

10: Shaft member 12: One end (end)
14: Center hole 14a: Peripheral surface portion 20: Center hole shaping processing device 21: Base (installation portion)
24: Movable center (moving device)
26: Whetstone (shaping member)
27: Clamp member (holding member)
261: Shaft part 262: Grindstone part H: Horizontal plane L1: Axis line L2: Axis line α: First angle β: Second angle γ: Third angle

Claims (2)

An installation part where a shaft member with a center hole is installed at the end,
A shaping member for shaping the center hole of the shaft member installed in the installation portion, and a shaping member.
It is provided with a moving device that rotates the shaped member around an axis and moves the shaped member so as to move toward and away from the center hole of the shaft member.
The shaping member and the shaft member are arranged in a state where the axis of the shaping member and the axis of the shaft member are inclined at a first angle.
The moving device is a center hole shaping device for a shaft member, characterized in that the shaping member is moved so that the shaping member and the center hole of the shaft member come into contact with each other. The shaft member is configured to be rotatable around an axis in the shaft member.
The center hole shaping apparatus for a shaft member according to claim 1, wherein the rotation speed around the axis of the shaping member is larger than the rotation speed around the axis of the shaft member.

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