JPH0710493B2 - Honing tools - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honing tool used for honing, and more particularly to an improvement in a structure in which a grindstone is projected and retracted from the outer periphery of a mandrel body.

[0002]

2. Description of the Related Art A conventional honing tool of this type is, for example, one having a structure as shown in FIG. 3 (see Japanese Utility Model Publication No. 52-13034).

In this honing tool, a guide groove b is provided in a cylindrical mandrel body a so as to extend in the axial direction, and a grindstone base d provided with a grindstone c is moved forward and backward in the radial direction at a tip portion in the guide groove b. A wedge e for advancing and retracting the grindstone base d is provided so as to be capable of advancing and retracting in the axial direction over substantially the entire length in the guide groove b.

Further, a driven cam surface f is provided on the inner diameter side of the grindstone head d, and a drive cam surface g cooperating with the driven cam surface f is provided on the outer diameter of the wedge e. When in the forward advancing position, the grindstone c projects radially outward from the mandrel main body a, while when the wedge e is in the rearward retracting position, the grindstone c retracts radially inward.

[0005] h is an inclined end face provided at the tip of the grinding wheel head d, i is a stopper pin that engages with this inclined end surface h, j is an inclined end surface provided at the rear end portion of the grinding wheel head d, and k is this A leaf spring that engages with the inclined end surface j and urges the grindstone base d inward in the radial direction. By the cooperation of these and the cam surfaces f and g, the protruding / retracting movement of the grindstone c is performed. Done.

[0006]

However, such a structure has the following problems, and an improvement thereof has been demanded.

(1) The diameter of the tip of the mandrel main body a has a great influence on the diameter of the honing process, so that the tip has a function of projecting and retracting the grindstone c. Therefore, it is not possible to process a hole having a relatively small diameter (for example, 10 mm or less), and its applicable range is narrow.

(2) A stopper pin i that cooperates with the inclined end face h is provided on the tip side of the grinding wheel base d, and this makes it possible to shorten the distance from the grinding wheel c to the tip of the mandrel body a. Since it was not possible, it was not suitable for blind hole drilling with a short length, and the applicable range was narrow from this point as well.

(3) The force for urging the grindstone head d inward in the radial direction is that the elastic force of the leaf spring k on the rear side moves to the front and rear of the grindstone head d due to the existence of the front inclined surface h and the stopper pin i. Although it has such a structure, it is not always easy to secure the biasing force evenly in the front and rear, and it is difficult to obtain a smooth and stable protrusion / retraction operation of the grindstone c. Moreover, due to this projecting / retracting operation, the grindstone c moves slightly in the front-rear direction and is not constant, which hinders the achievement of higher honing accuracy.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a honing tool which is most suitable for drilling small-diameter holes and blind holes, and which is capable of high-precision honing. To do.

[0011]

In order to achieve the above object, in the honing tool of the present invention, the tip side of the mandrel body is a small diameter portion having an outer diameter corresponding to the processing diameter, and the base end side thereof is the small diameter portion. The mandrel body is provided with a guide groove extending in the axial direction, and a grinding wheel head is provided in the guide groove so as to be capable of advancing and retreating in the radial direction. A wedge is provided so as to be movable back and forth in the axial direction, and the whetstone base is a long one that extends from the small diameter portion to the large diameter portion of the mandrel body, and the whetstone is provided on the outer diameter of the tip side thereof, and the inner diameter A pair of driven cam surfaces are provided, and the wedge is a long one extending from a small diameter portion to a large diameter portion of the mandrel body,
A pair of front and rear drive cam surfaces that cooperate with the driven cam surface are provided on the outer diameter thereof, and the drive cam surface and the driven cam surface are inclined surfaces that are inclined at the same angle, whereby the wedge advances forward. Position or rearward retreat position, the grindstone projects radially outward from the small diameter portion of the mandrel body, while the wedge is in the rear retreat position or forward advancing position, the grindstone is in the small diameter portion. It is characterized in that it is arranged to leave.

Incidentally, the axial direction and the radial direction respectively mean the axial direction and the radial direction with reference to the mandrel.

[0013]

[Operation] The tip side of the mandrel body is a small diameter portion having an outer diameter corresponding to the machining diameter, and the base end side is a large diameter portion having an outer diameter larger than the small diameter portion. Since the grindstone has a function of protruding and retracting, the diameter of the small diameter portion is reduced and the distance from the grindstone to the tip of the mandrel body is shortened.

The grindstone head and the wedge are long ones extending from the small diameter part to the large diameter part of the mandrel body, and a pair of front and rear driven cam surfaces are provided on the inner diameter of the grinding wheel base, and the driven cam surface is formed on the outer diameter of the wedge. A pair of front and rear drive cam surfaces that cooperate with each other are provided, and the drive cam surface and the driven cam surface are inclined surfaces that incline at the same angle, thereby ensuring a smooth and stable protrusion / withdrawal movement of the grindstone. .

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

A honing tool according to the present invention is shown in FIGS. 1 and 2, wherein the honing tool includes a mandrel body 1, a grindstone base 3 having a grindstone 2, and a wedge 4 for moving the grindstone base 3 forward and backward. And a pair of elastic ring members 5 and 5 as main parts, which are used by being attached to a main shaft of a honing machine or the like.

The mandrel body 1 has a cylindrical shape to be attached to a main shaft of a honing machine or the like, and its tip end side is a small diameter portion 6 having an outer diameter corresponding to the processing diameter, and its base end side is smaller than the small diameter portion 6. Large-diameter portion 7 having large-diameter outer diameter
It is said that. Further, the mandrel body 1 is provided with a guide groove 8 for holding the grindstone base 3 and the wedge 4.

The guide groove 8 extends in the longitudinal direction over the entire length of the mandrel body 1 in the axial direction, and in the depth direction, extends radially through the center of the mandrel body 1 to form a mandrel. It is opened to face the outer peripheral surface of the main body 1.

The grindstone base 3 is a thin plate-shaped elongated member extending from the small diameter portion 6 in the guide groove 8 to the large diameter portion 7 and is movable in the guide groove 8 only in the radial direction.

That is, the large diameter portion 7 of the mandrel body 1
While the positioning pin 9 is provided so as to project into the guide groove 8, a positioning recess 10 is provided in the grindstone base 3 so as to extend in the radial direction, and the positioning pin 9 is slidably engaged with the positioning recess 10. There is. As a result, the grinding wheel head 2 is guided by both side surfaces of the guide groove 8 and positioned so as to be slidable only in the radial direction.

On the outer diameter of the tip side of the grindstone base 3, the grindstone 2 is attached.
Is attached, and the whetstone 2 is configured to project and retreat to the outer peripheral surface 6a of the small diameter portion 6 of the mandrel body 1 by the advancing and retreating operation of the whetstone base 3.

A pair of front and rear driven cam surfaces 11 and 12 are provided on the inner diameter of the grindstone base 3, and these driven cam surfaces 11 and 12 are the drive cam surfaces 21 and 2 of the wedge 4.
A cam mechanism described later is configured in cooperation with the cam mechanism 2.

The wedge 4 is a thin plate-like elongated member extending from the small diameter portion 6 in the guide groove 8 to the large diameter portion 7 like the grindstone base 3 and is held in the guide groove 8 on the inner diameter side of the grindstone base 3. It is also possible to move back and forth in the axial direction.

That is, while the bottom surface 8a of the guide groove 8 is formed as a flat surface parallel to the axis, the bottom surface (inner diameter surface) 4a of the wedge 4 is also formed as a flat surface. It is reciprocated in the front-rear direction by an operating portion of the main shaft via an end portion (not shown), and slides on the bottom surface 8a of the guide groove 8.

The outer diameter of the wedge 4 is provided with the pair of drive cam surfaces 21 and 22. These drive cam surfaces 21 and 22 cooperate with the driven cam surfaces 11 and 12 of the grindstone base 3 to form a cam mechanism. Then, the grindstone base 3 is moved forward and backward in the radial direction.

The drive cam surfaces 21 and 22 and the driven cam surfaces 11 and 12 are inclined surfaces which are inclined rearward at the same angle toward the outer diameter side, in other words, inclinations which are inclined rearward at the same upward inclination in the drawing. It is regarded as a face.

By the action of these cam mechanisms 21, 11 and 22, 12, the grindstone 2 is moved in the radial direction with the grindstone surface 2a thereof kept parallel to the axis, and
When the wedge 4 is in the forward advance position, as shown in FIG. 2, the grindstone 2 projects radially outward from the outer peripheral surface 6a of the small diameter portion 6 of the mandrel body 1, while the wedge 4 is in the backward retract position. At some time, as shown in FIG. 1, the grindstone 2 is made to retreat into the small diameter portion 6.

The elastic ring member 5 is for always urging the grindstone base 3 inward in the radial direction, and specifically, an O-ring is used. The O-ring 5 is the mandrel body 1 described above.
Are fitted in a pair of annular grooves 25, 26 provided at the front and rear sides of the large-diameter portion 7, respectively. A spring or a coil spring may be used instead of the O-ring 5.

In this connection, the positioning pin 9 is
It is located between the front and rear O-rings 5, 5. Of the driven cam surfaces, the front driven cam surface 11 is provided at the inner diameter side position of the grindstone 2, and the rear driven cam surface 12 is provided.
Is provided at the position on the inner diameter side of the rear O-ring 5.

Thus, in the honing machine equipped with the honing tool having the above-described structure, the honing tool descends from above, and the mandrel body is inserted into the machined hole of the workpiece held by the honing jig (not shown). The small diameter part 6 of 1 rushes in.

Next, the wedge 4 moves forward.
Then, by the action of the cam mechanisms 21, 11 and 22, 12, the grindstone base 3 advances outward in the radial direction against the elastic force of the O-rings 5 and 5, whereby the grindstone 2 of the mandrel body 1 moves. The small-diameter portion 6 projects outward in the radial direction (see FIG. 2), and the grindstone surface 2a comes into contact with the inner diameter surface of the processed hole.

In this state, the honing tool is rotated while repeating the reciprocating motion in the vertical direction to precisely finish the inner diameter surface of the machined hole.

On the other hand, when the predetermined honing process is completed, the wedge 4 retracts rearward, and the cam mechanism 2
Action of 1, 11 and 22, 12 and the O-ring 5, 5
Due to the elastic force of, the whetstone base 3 retreats inward in the radial direction. Then, the grindstone 2 retreats radially inward from the small diameter portion 6 (see FIG. 1), the grindstone surface 2a thereof is separated from the inner diameter surface of the machined hole, and then the honing tool is raised to perform honing. Complete the process.

The present invention is not limited to the above-described embodiment, and various design changes can be made. For example, in the illustrated example, the drive cam surfaces 21, 22 and the driven cam surfaces 11, 12 constituting the cam mechanism are modified. Is an inclined surface that is inclined rearward toward the outer diameter side at the same angle, but in the opposite case, that is, an inclined surface that is inclined forward toward the outer diameter side at the same angle.

[0035]

As described in detail above, according to the present invention,
Various excellent effects as described below can be obtained.

(1) The tip side of the mandrel body is a small diameter portion having an outer diameter corresponding to the machining diameter, and the base end side is a large diameter portion having an outer diameter larger than the small diameter portion. Since the diameter portion is provided with a function for projecting and retracting the grindstone, the diameter of the small diameter portion can be reduced and the distance from the grindstone to the tip of the mandrel body can be shortened.

Therefore, it can be used for drilling a hole having a relatively small diameter (for example, 10 mm or less) and is also most suitable for a blind hole drilling with a short length of slime, and its applicable range is wide and versatile.

(2) The whetstone head and the wedge are long ones extending from the small diameter part to the large diameter part of the mandrel body, and a pair of front and rear driven cam surfaces are provided on the inner diameter of the whetstone and the outer diameter of the wedge is A pair of front and rear drive cam surfaces that cooperate with the driven cam surface are provided, and the drive cam surface and the driven cam surface are inclined surfaces that are inclined rearward toward the outer diameter side at the same angle, so that they are smooth and stable. It is possible to secure the protruding / retracting movement of the grindstone, which enables highly accurate honing processing.

(3) Since the cam mechanism composed of the above-mentioned cam surface is provided at two positions in the front-rear direction, the inclination angle of the cam surface can be made large in comparison with the case where there is one cam surface. As a result, the amount of movement of the wedge in the front-rear direction can be reduced, and the wedge can be prevented from protruding from the tip of the mandrel main body. From this point as well, a structure suitable for blind hole machining can be obtained.

(4) An annular groove is provided in the front and rear positions of the large diameter portion of the mandrel body, and an elastic ring member is fitted in the annular groove. The elastic force of the pair of elastic ring members causes the grindstone head to move. Is constantly urged inward in the radial direction, so that the returning operation of the grindstone, that is, the retreating operation inward in the radial direction is smooth and reliable.

That is, since the pair of front and rear elastic ring members apply a uniform biasing force to the front and rear of the grindstone base, it is possible to ensure a smooth and stable protrusion / withdrawal movement of the grindstone.

(5) Since the mandrel body is provided with the positioning pins, and the grindstone base is provided with the positioning portions engaged with the positioning pins extending in the radial direction. Due to the cooperation with the cam mechanism consisting of the cam surface, the grindstone does not move in the front-rear direction, but also moves in the radial direction while the grindstone surface remains parallel to the axis, resulting in higher honing. Processing accuracy can be realized.

(6) Further, since the grindstone base is positioned by the positioning pin and the positioning portion, the mandrel main body tip and the grindstone tip are accurately positioned and this distance can be suppressed to the minimum dimension. However, a structure suitable for blind hole processing can be obtained.

(7) Since the positioning pin is located between the pair of front and rear elastic ring members, a uniform elastic force of the elastic ring member acts on the position of the positioning pin to guide the wheel head in the radial direction. It is smooth, and in this respect as well, a stable protrusion / withdrawal movement of the grindstone is secured.

(8) Since the cam mechanism is provided at the inner diameter side position of the grindstone and the inner diameter side position of the elastic ring member on the rear side, the advancing and retreating operation of the grindstone base is performed stably, and in this respect as well The protruding / retracting operation of the grindstone is ensured. Moreover, even during the honing process, the whetstone does not swing, the outer diameter whetstone surface is stably held, and high working accuracy can be obtained.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view showing a honing tool which is an embodiment according to the present invention, showing a retracted state of a grindstone.

FIG. 2 is a front sectional view showing the same honing tool, showing a protruding state of a grindstone.

FIG. 3 is a front view showing a conventional honing tool with a partial incision.

[Explanation of symbols]

 1 Mandrel Main Body 2 Whetstone 3 Grindstone Base 4 Wedge 5 O-ring (Elastic Ring Member) 6 Small Diameter Part of Mandrel Main Body 7 Large Diameter Part of Mandrel Main Body 8 Mandrel Main Body Guide Groove 9 Positioning Pin 10 Positioning Recess (Positioning Part) 11, 12 Driven cam surface 21,22 Drive cam surface 25,26 Annular groove

Claims (6)

[Claims] 1. A mandrel main body attached to a main shaft of a honing machine, a grindstone having a grindstone capable of advancing and retreating in the radial direction of the mandrel main body, and a wedge for moving the grindstone base forward and backward. The main body has a small-diameter portion whose front end has an outer diameter corresponding to the machining diameter, and a proximal end which has a large-diameter portion having an outer diameter larger than that of the small-diameter portion. Is provided so as to extend in the axial direction, the whetstone head is provided in the guide groove so as to be capable of advancing and retreating in the radial direction, and the wedge is provided so as to be capable of advancing and retreating in the axial direction, and the whetstone head has a small diameter of the mandrel body. It is a long one that extends from the part to the large diameter part,
The whetstone is provided on the outer diameter on the tip side, and a pair of front and rear driven cam surfaces is provided on the inner diameter, and the wedge is a long one extending from the small diameter portion to the large diameter portion of the mandrel body, and its outer diameter Is provided with a pair of front and rear drive cam surfaces that cooperate with the driven cam surface, and the drive cam surface and the driven cam surface are inclined surfaces inclined at the same angle,
Thereby, when the wedge is in the forward advance position or the backward retract position, the grindstone projects radially outward from the small diameter portion of the mandrel body, while the wedge is in the backward retract position or the forward advance position. A honing tool, wherein the grindstone is adapted to retreat into the small diameter portion. 2. The driving cam surface and the driven cam surface are inclined surfaces that are inclined rearward and at the same angle toward the outer diameter side, whereby the whetstone is moved to the mandrel when the wedge is in the forward advancing position. The honing tool according to claim 1, wherein the honing tool is adapted to project radially outward from the small diameter portion of the main body, while the whetstone is retracted into the small diameter portion when the wedge is at the rearward retracted position. 3. An annular groove is provided at the front and rear positions of the large diameter portion of the mandrel body, and an elastic ring member is fitted in the annular groove, and the elastic head of the elastic ring member causes the wheel head to move. The honing tool according to claim 1, wherein the honing tool is constantly urged inward in the radial direction. 4. The honing tool according to claim 3, wherein the pair of driven cam surfaces are provided at an inner diameter side position of the grindstone and an inner diameter side position of the rear elastic ring member. 5. A positioning pin is provided on the mandrel body so as to project into the guide groove, and a positioning portion with which the positioning pin is engaged is provided on the grindstone base so as to extend in a radial direction. The honing tool described in 1. 6. The honing tool according to claim 5, wherein the positioning pin is located between the elastic ring members.