JP4165264B2 - Pin mirror cutter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pin mirror cutter that processes a crankshaft of a reciprocating internal combustion engine, for example.
[0002]
[Prior art]
Conventionally, for example, a pin mirror cutter is known as a tool for processing a crankshaft of a reciprocating internal combustion engine.
6 is a plan view showing a main part of a conventional example of a pin mirror cutter, FIG. 7 is an explanatory view showing a processing machine to which the pin mirror cutter is attached, and FIG. 8 is a schematic sectional view showing the main part of the pin mirror cutter. In these drawings, reference numeral 1 denotes a pin mirror cutter, 2 denotes a cutter body, 3 denotes a processing machine, and 4 denotes an adapter body.
[0003]
That is, the conventional pin mirror cutter 1 shown in FIGS. 6 to 8 includes an annular cutter body 2 and an adapter body that is detachably held and attached to a processing machine 3 (FIG. 7). 4 and a clamper 9 for fixing the cutter body 2 to the adapter body 4. A plurality of throw-away tips 6 are detachably attached to the inner peripheral portion of the cutter body 2 with bolts 8 so that the cutting blades 7 protrude radially inward (for example, Patent Documents). 1).
[0004]
On the outer periphery of the cutter body 2, there is provided an inclined surface 2A for gradually reducing the diameter so as to correspond to a mortar-shaped fitting notch 4A provided on the inner periphery of the adapter body 4, and the inclined surfaces 2A and 4A are in surface contact with each other. By doing so, the cutter body 2 is positioned relative to the adapter body 4 in the centripetal direction, and the cutter body 2 is also aligned with the adapter body 4 in the axial direction.
[0005]
A crankshaft (not shown), which is a workpiece, is bridged across the inside of the pin mirror cutter 1 and fixedly held on the chucks 3A, 3B on the processing machine 3 side. The pin mirror cutter 1 revolves while rotating on the crankshaft fixedly held by the chucks 3A and 3B and is appropriately moved in the axial direction so that the crankshaft is processed into a predetermined shape by the cutting edge 7. To do.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-191209 (paragraph number 0002-paragraph number 0008, FIGS. 7, 8, and 10)
[0007]
[Problems to be solved by the invention]
By the way, in the above-mentioned pin mirror cutter 1, the temperature of the cutter body 2 rises due to heat during processing and expands thermally. Therefore, the cutter body 2 is replaced and newly attached to the adapter body 4 during processing. In this case, there is a problem that the center of the cutter body 2 at room temperature is shifted from the adapter body 4 that is thermally expanded, and the cutter body 2 is also shifted in the axial direction, so that the axes are not aligned. It was. This problem is caused not only when the cutter body 2 is replaced during the processing as described above, but also because both the cutter body 2 and the adapter body 4 are thermally expanded during processing. There is also a possibility that the cutter body 2 in the assembled state is displaced from the adapter body 4 and the shaft cores do not match. If the shaft is misaligned, the crankshaft cannot be precisely machined into a perfect circle.
[0008]
The present invention has been made in consideration of such circumstances, and its purpose is to prevent the axial displacement of the cutter body by aligning the axis of the cutter body without regard to thermal expansion. An object of the present invention is to provide a pin mirror cutter capable of performing
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention proposes the following means.
The invention according to claim 1 includes an annular adapter main body mounted on the processing machine, and a cutter main body detachably mounted in the adapter, and a projecting portion extending outwardly on the outer periphery of the cutter main body. In the pin mirror cutter in which a fitting notch for fitting the projecting portion is formed on the inner periphery of the adapter body, the projecting portion gradually increases in width toward the front in the radial direction of the cutter body. characterized in that it is formed to be inclined so that the spread.
[0010]
According to the pin mirror cutter according to the present invention, when the protruding portion of the cutter body is formed to be inclined so as to gradually increase in width toward the front in the radial direction of the cutter body, for example, one protruding portion and Even if the shaft center is shifted between the fitting notches, the offset can be offset by the fitting between the other protrusion and the fitting notch, so the cutter body can be aligned with the adapter body in the centripetal direction. The shaft core can be made to coincide with each other, and can also be made to coincide with the axial direction, so that the cutter body can be favorably attached to the adapter body.
[0011]
According to a second aspect of the present invention, in the pin mirror cutter according to the first aspect, the width of the protrusion gradually decreases from the rear to the front in the insertion direction of the cutter main body with respect to the adapter main body, and in the thickness direction of the protrusion. It is characterized by having a wedge shape along.
[0012]
According to the pin mirror cutter according to the present invention, since the width gradually decreases from the rear to the front in the insertion direction of the cutter body with respect to the adapter body, the projection body has a wedge shape also in the thickness direction. On the other hand, when the cutter main body is fitted, the center of the cutter main body can be easily matched, and the axial displacement can be prevented more satisfactorily.
[0013]
According to a third aspect of the present invention, in the pin mirror cutter according to the second aspect, the protrusion includes a front side surface and a rear side surface among a front side surface and a rear side surface in a rotation direction during processing of the cutter body. The side surface is inclined at an equal angle symmetrical to each other in the thickness direction, the rear side surface is inclined at a smaller angle relative to the inclination angle of the front side surface in the thickness direction , the thickness direction in wherein the front side is one of the rear side is formed in parallel to the center axis angular width direction of the protruding portions with inclined.
According to the pin mirror cutter according to the present invention, the rear side surface and the front side surface in the rotational direction during machining of the cutter body are inclined at a symmetrical angle in the thickness direction, or the rear side surface is inclined by the front side surface. Since the front side surface is inclined and the rear side surface is formed at an angle parallel to the central axis in the width direction of the protruding portion, the width of the protruding portion is even in the thickness direction. Therefore, the axial displacement of the cutter body relative to the adapter body can be further prevented.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are views showing a pin mirror cutter according to a first embodiment of the present invention. FIG. 1 is a plan view showing a main part of the pin mirror cutter, and FIG. FIG. 3 is a side view of the projection of the cutter body as viewed from the thickness direction.
A pin mirror cutter 10 shown in FIG. 1 includes an annular adapter body 11 that is mounted on a processing machine (see FIG. 7), and an annular cutter body 12 that is detachably attached to the adapter body 11. .
[0015]
A plurality of outwardly extending protrusions 13 are formed on the outer periphery of the cutter body 12, while a fitting notch 14 for inserting the protrusion 13 and fitting the protrusion 13 on the inner periphery of the adapter body 11 is formed. Is formed. When the protruding portion 13 of the cutter main body 12 is inserted into the fitting notch 14 of the adapter main body 11, the cutter main body 12 is attached to the adapter main body 11 by being tightened by the clamper 15.
A plurality of throw-away tips 18 are detachably attached to the cutter body 12 by bolts 20 so that the cutting blades 19 protrude inward in the radial direction.
[0016]
The clamper 15 is a disc provided with a linear defect portion 16 on a part of the outer periphery, and is rotatably attached to the adapter main body 11 by a clamper bolt 17. The cutter main body 12 is attached to the adapter main body 11. At this time, although not shown, the fitting notch 14 is released so that the protruding portion 13 can be inserted into the fitting notch 14 by being rotated so that the missing portion 16 coincides with the base portion of the fitting notch 14. When the protrusion 13 is inserted into the fitting notch 14, the protrusion 13 is rotated so as to contact the tip of the protrusion 13 as shown in FIG. The cutter body 12 is firmly fixed to the adapter body 11.
[0017]
As shown in FIG. 1, each of the projecting portions 13 is formed to extend outward at equal intervals along a reference line A passing through the center O of the cutter body 12, and the radial front of the cutter body 12. The width of the protrusion 13 is gradually increased as it goes to the side, and both side surfaces 21 and 22 of the protrusion 13 are formed along a straight line extending radially from the center O.
That is, as shown in FIG. 2, the projecting portion 13 has an inverted trapezoidal shape in which the base portion of the cutter body 12 is formed with the narrowest width and gradually expands from the front to the front. It is defined by both side surfaces 21 and 22 that gradually expand as it reaches. Among these both side surfaces 21, 22, the side surface 21 is located in the front in the rotational direction B when the cutter body 12 is processed, and the side surface 22 is located in the rear in the rotational direction B, as shown in FIGS. It has become a thing.
[0018]
As shown in FIG. 2, the side surfaces 21 and 22 of the projecting portion 13 are symmetric with respect to a reference line A passing through the center O of the cutter body 12, and the reference line A and It is inclined at a desired angle α so as to intersect. This inclination angle α is selected based on the number of protrusions 13 in the cutter body 12 and the sizes and materials of the cutter body 12 and the adapter body 11.
[0019]
Further, the width between the side surfaces 21 and 22 of the protruding portion 13 varies along the thickness direction by gradually narrowing the width from the rear to the front in the insertion direction of the cutter body 12 with respect to the adapter body 11.
That is, among the two side surfaces 21 and 22 of the protruding portion 13, as shown in FIG. 3, the front side surface 21 and the rear side surface 22 in the rotational direction B are symmetric with each other, for example, the central axis in the width direction. It is inclined at an angle of 15 ° with respect to C and gradually becomes narrower. In other words, in the insertion direction of the cutter body 12 with respect to the adapter body 11, a wedge shape is formed so that the width between the side surfaces 21 and 22 gradually narrows from the rear to the front in the insertion direction.
[0020]
Accordingly, the protruding portion 13 has an inverted wedge shape whose width expands toward the front on the surface of the cutter main body 12, and in the thickness direction, the width gradually decreases from the rear to the front in the insertion direction with respect to the adapter main body 11. The wedge shape is inclined like this.
Note that both sides of the fitting notch 14 provided in the adapter body 11 are formed to be inclined at an angle corresponding to both side surfaces 21 and 22 of the projecting portion 13, and the distal end portion of the projecting portion 13 is securely attached to the base portion. It is formed to be slightly larger so that it can be fitted in.
[0021]
Since the pin mirror cutter 10 of this embodiment is configured as described above, first, when attaching the cutter body 12 to the adapter body 11, the clamper bolt 17 is loosened in advance and the clamper 15 is fitted to the adapter body 11. After the pivoting operation is performed to a position shifted from the fitting notch 14, the protruding portion 13 of the cutter body 12 is inserted into the fitting notch 14 in that state, and then the clamper 15 is pivoted from the retracted position. The cutter body 12 is fixed to the adapter body 11 by tightening the clamper bolt 17 while abutting on the body 12.
[0022]
In this way, when the cutter body 12 is fixed to the adapter body 11 and they are set on the processing machine, the processing machine is driven to make a crankshaft (not shown) as a workpiece. .
In this case, a protrusion 13 is provided on the outer periphery of the cutter body 12, and a fitting notch 14 for inserting the protrusion 12 is provided on the inner periphery of the adapter body 11, and the protrusion 13 is fitted in the fitting notch 14. Therefore, the driving force of the processing machine can be transmitted from the adapter main body 11 to the cutter main body 12 via the protruding portion 13, and therefore a sufficient driving force can be transmitted to the cutter main body 12. it can.
[0023]
During the above processing, the throw-away tip 18 of the cutter body 12 generates heat, and not only the cutter body 12 but also the adapter body 11 is thermally expanded. Therefore, the cutter body 12 is replaced and attached to the adapter body 11 during the processing. As a result, the center O of the cutter main body 12 may be shifted from the adapter main body 11 and may be shifted in the axial direction.
[0024]
However, if the protrusion 13 provided on the cutter body 12 is formed so as to gradually expand toward the front in the radial direction of the cutter body 12, the shaft between the one protrusion 13 and the fitting notch 14 is formed. Even if the core is displaced, the displacement can be offset by the fitting between the other protrusion 13 and the fitting notch 14, so that the cutter body 12 can be aligned with the adapter body 11 in the centripetal direction. The cores can be matched and can also be matched in the axial direction.
Therefore, the cutter main body 12 can be securely attached to the adapter main body 11 in a state where the shaft cores coincide with each other without being concerned with thermal expansion. This is the same not only when the cutter body 12 is replaced, but also when both the assembled cutter body 12 and the adapter body 11 are thermally expanded at the time of processing, and there is no possibility that the shaft core will shift. In this case, since both side surfaces 21 and 22 of the projecting portion 13 are formed so as to extend along a straight line extending radially from the center O, the shaft misalignment is unlikely to occur due to thermal expansion of each member. Can be kept as small as possible.
[0025]
Thus, when the width of the protruding portion 13 increases toward the front, the protruding portion 13 protrudes in the direction intersecting the direction of thermal expansion, that is, with respect to the reference line A including the center O of the cutter body 12. Since the side surfaces 21 and 22 are inclined so as to intersect with each other at a desired angle α, it is possible to reliably prevent the shaft core from shifting.
[0026]
In addition, since the protrusion 13 is inclined at a symmetrical angle between the front side surface 21 and the rear side surface 22 in the rotation direction B of the cutter body 12, that is, the protrusion 13 is a surface of the cutter body 12. In addition to being inclined in the direction, it is also inclined at a symmetric angle in the thickness direction, so that when the cutter body 12 is attached to the adapter body 11, the axis can be easily matched and at the time of processing Regardless of thermal expansion, it is possible to prevent the axial centers of the adapter main body 11 and the cutter main body 12 assembled with each other from being displaced.
[0027]
Further, when the protruding portion 13 is formed to be widened, the adapter body 11 and the cutter can be cut by fitting the protruding portion 13 into the fitting notch 14 as compared with the case of a tapered shape. When the main body 12 is assembled, the fitting force of the cutter main body 12 to the adapter main body 11 can be increased, so that the assembling rigidity can be increased.
[0028]
In the illustrated embodiment, the side surfaces 21 and 22 of the projecting portion 13 provided on the cutter body 12 are formed so as to be inclined at an equal angle that is symmetrical between the front and the rear in the rotation direction B. However, the present invention is not limited to this, and may be formed to be inclined at an uneven angle as shown in FIG.
That is, FIG. 4 is a view showing a pin mirror cutter according to a second embodiment of the present invention, corresponding to FIG. 3, wherein the front side surface 21 is at an angle of 20 ° and the rear side surface 22 is. Is formed at an angle of 10 °.
[0029]
Furthermore, you may form in the angle shown in FIG. FIG. 5 is a view showing a pin mirror cutter according to a third embodiment of the present invention, corresponding to FIGS. 3 and 4, wherein the front side surface 21 is at an angle of 30 ° and the rear side surface. 22 is formed at an angle parallel to the central axis C, that is, at an angle of 0 °.
[0030]
As shown in FIGS. 4 and 5, when the angle of the rear side surface 22 is made smaller than the angle of the front side surface 21 in the protruding portion 13, the front side surface 21 in the rotation direction B of the protruding portion 13 is cut during processing. Even if resistance is applied, the rear side surface 22 in the rotation direction B can give a rigidity force that can withstand the resistance force, so that the driving force transmitted from the adapter body 11 is reliably transmitted to the cutter body 12 and is good. Transmission power is obtained.
[0031]
Therefore, in the protrusion 13, the front side surface 21 and the rear side surface 22 in the rotation direction B may be inclined at an equal angle that is symmetrical to each other, and the rear side surface 22 is equivalent to the front side surface 21. It suffices to incline at an angle of or smaller than that angle.
[0032]
Then, according to the illustrated embodiment, both side surfaces 21 and 22 of the protrusion 13 are formed so as to expand at an angle α with respect to the reference line A on the surface of the cutter body 12 as shown in FIGS. 1 and 2. Although an example is shown, it is a matter of course that a larger angle or a smaller angle may be used. That is, in the embodiment, since the number of protrusions 13 is provided from the relationship between the dimensions and materials of the cutter main body 12 and the adapter main body 11, the example formed at the above-described angle is shown. What is necessary is just to select suitably based on the number of the protrusion parts 13, the cutter main body 12, the external dimensions of the adapter main body 11, etc. FIG.
Moreover, although the example formed in the annular | circular shape was shown as the adapter main body 11, since an outer periphery makes polygonal shape, it is not limited only to an annular | circular shape.
[0033]
【The invention's effect】
As described above, according to the first aspect of the present invention, the protrusions of the cutter body are formed to be inclined so that the width gradually increases toward the front in the radial direction of the cutter body, Since it is configured so that the deviation can be canceled by fitting between the fitting notches, the cutter body can be aligned with the centripetal direction with respect to the adapter body, and the axial center can be matched in the axial direction, The effect that the cutter main body can be favorably attached to the adapter main body is obtained.
[0034]
According to the second aspect of the present invention, when the cutter main body is fitted into the adapter main body, the center of the cutter main body can be easily matched, and an effect of further preventing the axial displacement can be obtained.
[0035]
According to the invention which concerns on Claim 3, the width | variety differs even if a protrusion part follows a thickness direction, and the effect which can perform the shift | offset | difference of the axial direction of a cutter main body with respect to an adapter main body more can be acquired.
[Brief description of the drawings]
FIG. 1 is a plan view showing a main part of a pin mirror cutter according to a first embodiment of the present invention.
FIG. 2 is an enlarged explanatory view showing a fitting state between a cutter body and an adapter body.
FIG. 3 is a side view of the protruding portion of the cutter body as viewed from the thickness direction.
4 is a view showing a pin mirror cutter according to a second embodiment of the present invention, and is a side view corresponding to FIG. 3. FIG. 5 is a pin according to a third embodiment of the present invention. It is a figure which shows a mirror cutter, Comprising: It is a side view corresponding to FIG.3 and FIG.4.
FIG. 6 is a plan view showing a main part of a conventional example of a pin mirror cutter.
FIG. 7 is an explanatory view showing a processing machine to which a pin mirror cutter is attached.
FIG. 8 is a schematic cross-sectional view showing a main part of the pin mirror cutter.
[Explanation of symbols]
10 Pin mirror cutter 11 Adapter main body 12 Cutter main body 13 Protruding portion 14 Fitting notch 21 Front side surface 22 of the projecting portion Rear side surface α of the projecting portion A Angle between both side surfaces of the projecting portion A Reference line B Rotation direction C Center axis O in the width direction Center of the cutter body

Claims (3)

An annular adapter body mounted on the processing machine, and a cutter body detachably mounted in the adapter;
In the pin mirror cutter in which a plurality of protrusions extending outward are formed on the outer periphery of the cutter body, while a notch for fitting is formed on the inner periphery of the adapter body.
The pin mirror cutter is characterized in that the protruding portion is formed with a width that gradually increases toward the front in the radial direction of the cutter body. The pin mirror cutter according to claim 1,
The pin mirror cutter is characterized in that the width of the projecting portion is gradually narrowed from the rear to the front in the insertion direction of the cutter body relative to the adapter body, and has a wedge shape along the thickness direction of the projecting portion. The pin mirror cutter according to claim 2,
The protruding portion is inclined at an equal angle in which the front side surface and the rear side surface are symmetrical with each other in the thickness direction among the front side surface and the rear side surface in the rotation direction when the cutter body is processed. , the rear side with respect to the inclination angle of the front side in the thickness direction is formed to be inclined by less small angle, the width direction of the rear side surface the protrusion with the front side in the thickness direction inclined A pin mirror cutter, characterized in that the pin mirror cutter is formed at an angle parallel to the central axis .

Images