JP4413579B2 - Pin mirror cutter - Google Patents

Description

  The present invention relates to a pin mirror cutter for processing, for example, a crankshaft used in a reciprocating internal combustion engine, and more particularly to an attachment mechanism for attaching a pin mirror cutter to an adapter attached to a processing machine. .

Conventionally, a generally annular adapter to be mounted on a processing machine, and a substantially annular cutter body that rotates around an axis by being attached to an inner peripheral portion of the adapter, the cutter body has an outer periphery. A substantially annular flange portion that protrudes radially outward from the entire circumference of the surface is formed, and the adapter has a substantially annular step portion that is recessed from the entire circumference of the inner circumferential surface to the radially outer periphery and receives the flange portion. A pin mirror cutter in which is formed is known.
In such a pin mirror cutter, when the cutter body is inserted into the inner peripheral portion of the adapter along the axial direction, the flange portion of the cutter body and the stepped portion of the adapter overlap each other in the radial direction of the cutter body. Surface contact is made and the cutter body is positioned axially relative to the adapter. Then, a plurality of key members are fitted into a plurality of notches formed so as to be recessed from the outer peripheral surface of the cutter main body to the radially inner peripheral side, and one end surface of the cutter main body is pressed by a plurality of clampers. Thus, the cutter main body is fixed to the adapter in the circumferential direction, the axis of the cutter main body is substantially aligned with the axis of the adapter, and the cutter main body is attached to the inner peripheral portion of the adapter.

  However, in such a conventional pin mirror cutter, the length in the radial direction of the cutter body is set to be long with respect to the substantially annular contact surface formed by the surface contact between the flange portion of the cutter body and the stepped portion of the adapter. However, although one end face of the cutter body is pressed by a plurality of clampers, there is a problem that it is weak to a large load in the thrust direction (load in the axial direction of the cutter body). In other words, when the cutter body is attached to the adapter and a load is applied in the thrust direction, the flange portion of the cutter body and the stepped portion of the adapter will bend, and the cutter body is thrust in the thrust direction with respect to the adapter. Since the deviation in the axial direction of the cutter body is caused, the deflection accuracy of the plurality of cutting blades provided on the inner peripheral portion of the cutter body is deteriorated.

Further, in Patent Document 1, a plurality of protrusions are formed on the cutter body so as to protrude from the outer peripheral surface to the outer peripheral side in the radial direction, and the adapter is recessed from the inner peripheral surface to the outer peripheral side in the radial direction. A plurality of notches for fitting the parts are formed, and each of the plurality of protrusions and the plurality of notches has a distance between a pair of side surfaces facing the circumferential direction. There is disclosed a pin mirror cutter having a taper shape that becomes smaller as it goes forward (in the direction of insertion into the inner peripheral portion).
In such a pin mirror cutter, when the cutter body is inserted into the inner periphery of the adapter along the axial direction, the plurality of protrusions of the cutter body are respectively fitted into the plurality of notches of the adapter. Thus, the cutter body is positioned in the axial direction with respect to the adapter, the cutter body is fixed in the circumferential direction with respect to the adapter, and the axis of the cutter body is substantially matched with the axis of the adapter. The cutter body is attached to the inner periphery of the adapter by pressing one end surface of the cutter body with a plurality of clampers.
JP-A-8-118125

  However, although the pin mirror cutter disclosed in Patent Document 1 is strong against a load in the thrust direction, the axial positioning of the cutter main body with respect to the adapter forms a taper-shaped protrusion and a taper shape. Since this is only done by fitting with the notch, if the adapter is thermally expanded by cutting heat generated during processing, if the cutter is replaced, the cutter will be displaced in the axial direction with respect to the adapter. There was a problem that. In other words, the thermal expansion of the adapter expands the width of the plurality of notches formed in the adapter, so the projection of the cutter body at room temperature fits into the expanded notches. Then, the cutter main body is inserted too far into the inner peripheral portion of the adapter, and the runout accuracy of the plurality of cutting blades provided on the inner peripheral portion of the cutter main body is deteriorated.

  The present invention has been made in view of the above problems, and keeps the cutting blade deflection accuracy high without causing the cutter body to shift in the axial direction with respect to the adapter even in the thrust load or cutting heat. An object of the present invention is to provide a pin mirror cutter.

In order to solve the above-described problems and achieve such an object, a pin mirror cutter according to the present invention includes an adapter mounted on a processing machine and an axial direction toward the front side of the cutter insertion direction of the adapter. at pin mirror cutter and a substantially annular cutter body is rotated around the axis by attached is inserted along, said cutter body, the rear side region of the cutter insertion direction of the peripheral surface All the the periphery substantially annular flange portion protruding in the radial direction of the cutter body, and a plurality of protrusions partially projecting at the rear side area of the cutter insert to a radial direction from the flange portion is formed in the It is, in the adapter, receiving said flange portions with recessed from the entire circumference of the cutter insertion direction of the rear side of the area of the peripheral surface in the radial direction of the cutter body An annular step portion, said cutter insertion direction of the rear side of the region and a plurality of cutouts partially recessed in the radial direction than the step portion is not formed, a state in which the cutter body is attached to said adapter The flange portion and the stepped portion are brought into surface contact with each other so as to overlap each other in the radial direction of the cutter body, and the length in the radial direction of the cutter body at the contact surface is the thickness D of the cutter body. Is set to a range of 0.1D to 1.0D, and among the pair of wall surfaces in the protrusion, a wall surface located on the rear side in the cutter rotation direction and facing the rear side in the cutter rotation direction is Whereas the cutter body is extended along the cutter insertion direction when the adapter is inserted into the adapter, it is located on the front side of the cutter rotation direction and faces the front side of the cutter rotation direction. The surface is inclined to the rear side in the cutter rotation direction as it goes toward the front side in the cutter insertion direction, and the cutter rotation direction is located on the rear side in the cutter rotation direction among the pair of wall surfaces in the notch portion. The wall surface facing the front side of the cutter is extended along the cutter insertion direction, whereas the wall surface facing the rear side of the cutter rotation direction and located on the front side in the cutter rotation direction is The plurality of protrusions are fitted into the plurality of notches, respectively, with the cutter body being attached to the adapter and being inclined toward the rear side in the cutter rotation direction as it goes toward the front side. By doing so, the cutter body is fixed in the circumferential direction with respect to the adapter, and the axis of the cutter body is substantially aligned with the axis of the adapter. It is characterized by.

According to the present invention, in a state where the cutter body is attached to the adapter, the cutter body is in contact with the adapter so that the flange portion of the cutter body and the stepped portion of the adapter overlap in the radial direction of the cutter body. Therefore, even if the cutter body is replaced when the adapter is thermally expanded due to cutting heat, the replaced cutter body is hardly displaced in the axial direction with respect to the adapter. .
Since the length in the radial direction of the cutter body is set to 1.0 D or less with respect to the substantially annular contact surface formed by surface contact between the flange portion of the cutter body and the stepped portion of the adapter, the thrust is reduced. Even if a large load is applied in the direction, the flange portion and the stepped portion are not easily bent, and the cutter body does not shift in the axial direction with respect to the adapter due to the load in the thrust direction. Moreover, since the length in the radial direction of the cutter body is set to 0.1D or more for the substantially annular contact surface, the positioning function of the cutter body with respect to the adapter is not impaired.
Therefore, it is possible to continue maintaining high runout accuracy of a plurality of cutting edges provided on the cutter body, therefore, it is possible to improve the machining accuracy of the crank shaft.

Further, in the present invention, the cutter body is formed with a plurality of protrusions protruding radially from the peripheral surface, and the adapter is formed with a plurality of notches recessed radially from the peripheral surface. The cutter body is fixed to the adapter in the circumferential direction by fitting the plurality of protrusions to the plurality of notches in a state where the cutter body is attached to the adapter. At the same time, since the axis of the cutter body is substantially coincident with the axis of the adapter, it is possible to easily fix and center the adapter in the circumferential direction with a simple configuration.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the pin mirror cutter according to the present embodiment is inserted into a substantially annular adapter 10 to be mounted on a processing machine, and an inner peripheral portion of the adapter 10 and an inner periphery of the adapter 10. A substantially annular cutter body 50 centering on the axis O rotated around the axis O by being attached to the part is provided.
In addition, the inner peripheral portion of the cutter body 50 is cut as a pin blade for processing the outer peripheral surface of the pin portion (shaft portion) of the crankshaft or as a wave blade for processing the side surface of the counterweight portion of the crankshaft. A plurality of throw-away tips having blades are attached, but are omitted in the drawing.

3 and 4, on the outer peripheral surface 51 of the cutter main body 50, the rear side in the cutter insertion direction A (the rear side in the direction when the cutter main body 50 is inserted into the inner peripheral portion of the adapter 10, FIG. 3 and FIG. 4 is projected toward the radially outer peripheral side (the right side in FIGS. 3 and 4) of the cutter body 50.
Therefore, the cutter body 50 is formed with a substantially annular flange portion 52 that protrudes from the entire circumference of the outer circumferential surface 51 to the radially outer circumferential side. The flange portion 52 has a front side in the cutter insertion direction A. A substantially annular constraining surface 53 is formed.

Furthermore, as shown in FIG. 4, a plurality of locations in the region on the rear side in the cutter insertion direction A on the outer peripheral surface 51 of the cutter main body 50 are protruded from the flange portion 52 toward the outer peripheral side in the radial direction of the cutter main body 50. It has been.
Thus, the cutter body 50 has a plurality of (for example, four or more) projecting portions 54, which are formed in a substantially rectangular parallelepiped shape partially protruding from the outer peripheral surface thereof, and are arranged at substantially equal intervals in the circumferential direction of the cutter body 50. As shown in FIG. 5, a pair of wall surfaces 55, 55 facing the front side and the rear side (circumferential direction) in the cutter rotation direction T are formed on each of the plurality of protrusions 54. Has been.

  Here, as shown in FIG. 5, of the pair of wall surfaces 55, 55 in one protrusion 54, the wall surface 55 located on the rear side in the cutter rotation direction T and facing the rear side in the cutter rotation direction T is While extending along the insertion direction A (the axis O direction of the cutter body 50, the thickness direction of the cutter body 50), it is located on the front side of the cutter rotation direction T and the front side of the cutter rotation direction T is The facing wall surface 55 is inclined so as to go to the rear side in the cutter rotation direction T as it goes to the front side in the cutter insertion direction A (lower side in FIG. 5).

On the other hand, as shown in FIGS. 3 and 4, on the inner peripheral surface 11 of the adapter 10, the entire peripheral portion in the region on the rear side in the cutter insertion direction A is recessed toward the radially outer peripheral side of the cutter body 50. Yes.
Therefore, the adapter 10 is recessed from the entire circumference of the inner peripheral surface 11 to the outer peripheral side in the radial direction and opens to one end surface 16 facing the rear side in the cutter insertion direction A of the adapter 10 to receive the flange portion 52. A substantially annular step portion 12 is formed, and a substantially annular restraining surface 13 facing the rear side in the cutter insertion direction A is formed on the step portion 12.

Furthermore, as shown in FIG. 4, in the inner peripheral surface 11 of the adapter 10, a plurality of locations in the region on the rear side in the cutter insertion direction A are recessed toward the radially outer peripheral side of the cutter body 50 rather than the stepped portion 12. ing.
As a result, the adapter 10 has a substantially rectangular parallelepiped shape partially recessed from the inner peripheral surface thereof, and a plurality of (for example, four or more) cutout portions 14 for fitting the plurality of projections 54. Are formed so as to be arranged at substantially equal intervals in the circumferential direction of the adapter 10, and each of the plurality of cutout portions 14 ... has a front side and a rear side in the cutter rotation direction T as shown in FIG. A pair of wall surfaces 15, 15 facing (circumferential direction) are formed.

  Here, as shown in FIG. 5, of the pair of wall surfaces 15, 15 in one notch portion 14, the wall surface 15 positioned on the rear side in the cutter rotation direction T and facing the front side in the cutter rotation direction T is While extending along the insertion direction A (the thickness direction of the cutter body 50, the direction of the axis O of the cutter body 50), it is located on the front side of the cutter rotation direction T and the rear side of the cutter rotation direction T is The facing wall surface 15 is inclined so as to go to the rear side in the cutter rotation direction T as it goes to the front side in the cutter insertion direction A (lower side in FIG. 5).

  When the cutter body 50 is inserted into the inner peripheral portion of the adapter 10 along the axis O direction toward the front side in the cutter insertion direction A, the flange portion 52 of the cutter body 50 is received by the step portion 12 of the adapter 10, and The plurality of protrusions 54 of the cutter body 50 are respectively fitted into the plurality of notches 14 of the adapter 10.

When the flange portion 52 of the cutter body 50 is received by the step portion 12 of the adapter 10, the restraint surface 53 of the flange portion 52 and the restraint surface 13 of the step portion 12 overlap each other in the radial direction of the cutter body 50. A substantially annular contact surface that is brought into surface contact and extends along the radial direction of the cutter body 50 is formed.
In this way, when the restraining surface 53 of the flange portion 52 and the restraining surface 13 of the stepped portion 12 are in surface contact, the cutter body 50 is positioned with respect to the adapter 10 in the axis O direction.

  Here, in the present embodiment, as shown in FIGS. 3 and 4, the substantially annular contact surface formed by the surface contact between the restraint surface 53 of the flange portion 52 and the restraint surface 13 of the stepped portion 12. The length d along the radial direction of the cutter body 50, that is, the width of the contact surface is 0.1 D to 1.D with respect to the thickness D of the cutter body 50 (the length along the axis O direction in the cutter body 50). The range is set to 0D.

The plurality of protrusions 54 of the cutter body 50 are respectively fitted into the plurality of notches 14 of the adapter 10, whereby a pair of wall surfaces 55 and 55 in each protrusion 54 and a pair of notches 14. The wall surfaces 15 and 15 are brought into surface contact with each other.
In this way, the pair of wall surfaces 55 and 55 of each projection 54 and the pair of wall surfaces 15 and 15 of each notch 14 are in surface contact with each other, so that the cutter body 50 is fixed to the adapter 10 in the circumferential direction. At the same time, the axis O of the cutter body 50 is substantially matched with the axis of the adapter 10.

  As described above, the cutter body 50 is inserted into the inner peripheral portion of the adapter 10, the cutter body 50 is positioned in the axis O direction with respect to the adapter 10, and the cutter body 50 is positioned in the circumferential direction with respect to the adapter 10. In a state where the axis line O of the cutter body 50 is fixed and substantially coincides with the axis line of the adapter 10, a plurality of (for example, four or more) clampers 30... The cutter main body 50 is firmly attached to the inner peripheral portion of the adapter 10 by pressing the one end face 56 that faces.

The clamper 30 has a substantially disk shape having a cutout portion 31 in which a part of the outer peripheral portion is cut out linearly, and the cutter body 50 is inserted into the inner peripheral portion of the adapter 10 in the state where the cutter is cut. The end face 56 of the main body 50 is screwed with a bolt 33 in a substantially circular counterbore part 32 formed on the end face 16 of the adapter 10 so that a part of the end face 56 also touches the end face 56.
In the state where the cutter main body 50 is inserted into the inner peripheral portion of the adapter 10, the clamper 30 is provided between a plurality of circumferentially adjacent protrusions 54 (a plurality of circumferentially adjacent notches 14...). Each one is arranged at substantially equal intervals in the circumferential direction.

The clamper 30 can be rotated around the bolt 33 in the counterbore portion 32 by loosening the bolt 33 so that the notch portion 31 is located on the radially inner peripheral side of the cutter body 50. By rotating the clamper 30, the cutter body 50 can be inserted into the inner peripheral portion of the adapter 10, and the cutter main body 50 can be removed from the inner peripheral portion of the adapter 10. On the contrary, the cutter body 50 inserted into the inner peripheral portion of the adapter 10 by rotating the clamper 30 so that the notch portion 31 is not positioned on the radially inner peripheral side of the cutter main body 50 and then tightening the bolt 33. Can be firmly attached to the inner peripheral portion of the adapter 10.
In addition, when one end surface 56 of the cutter main body 50 (more precisely, the bottom surface of the counterbore portion 32) is pressed by the clampers 30 and the cutter main body 50 is firmly attached to the inner peripheral portion of the adapter 10, each clamper 30 is located closer to the radially inner peripheral side of the cutter body 50 than the flange portion 52 that protrudes from the outer peripheral surface 51 of the cutter body 50. It has become.

  The pin mirror cutter having such a configuration is arranged along the direction of the axis of the crankshaft (axis O of the cutter body 10) in a state where the crankshaft spanned by the chuck is passed through the inner space of the cutter body 50. The crankshaft rotates around the axis O of the cutter body 10 and revolves around the axis of the crankshaft, thereby processing the crankshaft into a predetermined shape.

  According to the pin mirror cutter of this embodiment as described above, the flange portion 52 of the cutter main body 50 and the stepped portion 12 of the adapter 10 have a diameter of the cutter main body 50 with the cutter main body 50 attached to the adapter 10. Since the cutter main body 50 is positioned in the direction of the axis O with respect to the adapter 10 by surface contact so as to overlap in the direction, the cutter main body 50 is replaced when the adapter 10 is thermally expanded by cutting heat. However, the newly replaced cutter body 50 is hardly displaced in the axis O direction with respect to the adapter 10.

And about the substantially cyclic | annular contact surface which the flange part 52 of the cutter main body 50 and the level | step-difference part 12 of the adapter 10 surface-contact, the length d in the radial direction of the cutter main body 50 is set to 1.0 D or less. Therefore, even if a large load is applied in the thrust direction, the flange portion 52 and the stepped portion 12 are not easily bent, and the cutter body 50 is displaced in the axis O direction with respect to the adapter 10 by the load in the thrust direction. The phenomenon can also be suppressed. In addition, since the length d in the radial direction of the cutter body 50 is set to 0.1 D or more with respect to the substantially annular contact surface, the cutter body 50 cannot be reliably positioned with respect to the adapter 10. There is nothing wrong.
In addition, it is more preferable that the length d in the radial direction of the cutter body 50 with respect to the substantially annular contact surface is set in a range of 0.2D to 0.4D.

  Therefore, in the present embodiment, the cutter body 50 does not cause a shift in the axis O direction with respect to the adapter 10 due to factors such as cutting heat and a load in the thrust direction. The runout accuracy of the plurality of cutting blades provided in the portion can be kept high, and as a result, the processing accuracy of the crankshaft can be improved.

  In the present embodiment, the cutter body 50 is fitted to the adapter 10 by fitting the plurality of protrusions 54 formed on the cutter body 50 to the plurality of notches 14 formed on the adapter 10, respectively. Are fixed in the circumferential direction, and the axis O of the cutter body 50 is made to substantially coincide with the axis of the adapter 10, so that the adapter 10 can be fixed and cored in the circumferential direction with a simple configuration. It can be done easily.

In the above-described embodiment, the present invention is applied to a so-called internal type pin mirror cutter in which the cutter body is attached to the inner peripheral portion of the adapter. However, the present invention is not limited thereto. Instead, the present invention may be applied to a so-called external type pin mirror cutter in which the cutter body is attached to the outer peripheral portion of the adapter.
In this case, the cutter main body 50 has a substantially annular flange portion that protrudes from the entire circumference of the inner peripheral surface thereof toward the radially inner peripheral side, and a plurality of protrusions that similarly protrude from the inner peripheral surface toward the radially inner peripheral side. The adapter 10 is formed with a substantially annular step portion which is recessed from the entire outer periphery of the outer peripheral surface to the radially inner peripheral side and receives the flange portion, and is also recessed from the outer peripheral surface to the radially inner peripheral side. A notch is formed.

It is a top view of the pin mirror cutter by this embodiment. It is a principal part enlarged view of the pin mirror cutter shown in FIG. FIG. 3 is a sectional view taken along line XX in FIG. 2. It is the YY sectional view taken on the line of FIG. FIG. 3 is a sectional view taken along line ZZ in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Adapter 11 Inner peripheral surface 12 Step part 13 Restraint surface 14 Notch 30 Clamper 50 Cutter main body 51 Outer peripheral surface 52 Flange part 53 Constrained surface 54 Projection part

Claims (1)

An adapter to be attached to the processing machine, and a substantially annular cutter body is rotated around the axis by attached is inserted in the axial direction toward the front side of the cutter insertion direction to the adapter In pin mirror cutter,
The cutter body includes a substantially annular flange portion that protrudes in the radial direction of the cutter body from the entire circumference in a region on the rear side in the cutter insertion direction on the peripheral surface, and a region in the rear side in the cutter insertion direction. And a plurality of protrusions partially protruding in the radial direction from the flange portion, and the adapter has a circumferential surface on the rear side in the cutter insertion direction from the entire circumference in the radial direction of the cutter body. A substantially annular stepped portion that is recessed and receives the flange portion, and a plurality of cutout portions that are partially recessed in the radial direction from the stepped portion in a region on the rear side in the cutter insertion direction ,
In a state where the cutter body is attached to the adapter, the flange portion and the stepped portion are brought into surface contact with each other so as to overlap each other in the radial direction of the cutter body, and the radial direction of the cutter body at the contact surface Is set in a range of 0.1D to 1.0D with respect to the thickness D of the cutter body,
Of the pair of wall surfaces in the protrusion, the wall surface located on the rear side in the cutter rotation direction and facing the rear side in the cutter rotation direction extends along the cutter insertion direction when the cutter body is inserted into the adapter. On the other hand, the wall surface located on the front side in the cutter rotating direction and facing the front side in the cutter rotating direction is inclined to the rear side in the cutter rotating direction as it goes toward the front side in the cutter inserting direction. And
Of the pair of wall surfaces in the notch, the wall surface located on the rear side in the cutter rotation direction and facing the front side in the cutter rotation direction is extended along the cutter insertion direction, whereas the cutter rotation The wall surface located on the front side in the direction and facing the rear side in the cutter rotation direction is inclined so as to go to the rear side in the cutter rotation direction as it goes toward the front side in the cutter insertion direction.
While the cutter body is attached to the adapter, the plurality of protrusions are respectively fitted to the plurality of notches, whereby the cutter body is fixed to the adapter in the circumferential direction. A pin mirror cutter characterized in that an axis of the cutter body is substantially coincident with an axis of the adapter.

Images