JPH08257819A - Attaching mechanism of pin mirror cutter - Google Patents

Abstract

PURPOSE: To surely perform centering by facilitating attaching/detaching of a highly rigid cutter main body. CONSTITUTION: A key groove 20 in a recessed groove shape is formed in the joined surface 12a side of the outer peripheral side flange 12 of an annular cutter main body 2. A key member 22 is fixed to the joined surface 11b side of the inner peripheral side steep part 11 of a cutter attaching part. The engaging parts 23 of the key groove 20 and the key member 22 are formed into a trapezoidal section shape having almost the same dimension so as to engage with each other. The inclined surfaces 20c and 20d of the key groove 20 and the engaging part 23 and inclined side surfaces 23c and 23d are inclined in the opposing directions. When loaded, the two opposing inclined surfaces 23c and 23d of the engaging part 23 of the key member 22 come into surface contact with the inclined surfaces 20c and 20d and the flange 12 also comes into surface contact with the joined surfaces 12a and 11b of the step part 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin mirror cutter for processing a crankshaft of a reciprocating internal combustion engine, and more particularly, a cutter body of the pin mirror cutter is attached to a cutter mounting portion provided on a processing machine. The present invention relates to a mounting mechanism of a pin mirror cutter for attaching and detaching.

[0002]

2. Description of the Related Art Conventionally, as a tool for machining a crankshaft of a reciprocating internal combustion engine, for example, there is a pin mirror cutter as shown in FIG. The pin mirror cutter 1 can be attached to and detached from a cutter body 2 having an annular shape by a bolt 5 in a state where a plurality of chips 3 have respective cutting edges 4 protruding from the inner peripheral surface of the cutter body 2. It is installed. Then, as shown in FIG. 9, the pin mirror cutter 1 is attached to a cutter attaching portion 7 provided in the processing machine 6 with its axis aligned with the main shaft (not shown).
A crankshaft (not shown), which is a work material, is laid across the chucks 9 and 10 provided in the processing machine 6 so as to pass through the inner space of the pin mirror cutter 1. And
At the time of driving, the pin mirror cutter 1 is rotated around its own axis by the main shaft in a fixed direction (direction of arrow A in FIG. 8). Moreover, the pin mirror cutter 1 revolves around the fixedly held crankshaft while being revolved and appropriately moved in the axial direction, so that the crankshaft is processed into a predetermined shape by the cutting edge 4 of the pin mirror cutter 1. It has become so.

By the way, such a pin mirror cutter 1
In the method of machining a crankshaft using, the coaxiality between the axis of the pin mirror cutter 1 and the rotation axis of the main shaft of the machine greatly affects the machining accuracy. Therefore, as shown in FIGS. 8 and 10, an annular step portion 11 coaxial with the main shaft is formed on the inner peripheral portion of the cutter attachment portion 7 of the processing machine 6, and the outer peripheral portion of the cutter body 2 of the pin mirror cutter 1 is formed. Forming an annular flange 12 on them, and fitting them together,
Four recessed fitting portions 13 are formed on a wall surface 11a of the stepped portion 11 facing the radial center side, and a key member 14 (one of which is omitted in the drawing) protruding from the wall surface 11a is fitted and arranged. I have set up. These key members 14 have a substantially rectangular parallelepiped shape, and are arranged in a cross direction at 90 ° intervals in a plan view of the pin mirror cutter 1 in FIG.
The center line m in the width direction intersects with the center P (axis line) in the radial direction, is accurately positioned and fitted into each recessed fitting portion 13, and is fixed with a bolt 15.

A key groove 17 (see FIGS. 8 and 11) having a rectangular cross section and having the same width as the key member 14 is formed on the outer peripheral portion of the cutter body 2 in the same arrangement as the key member 14. By fitting the key groove 17 into the key member 14, the radial movement of the cutter body 2 with respect to the stepped portion 11 of the cutter attachment portion 7 is restrained and the coaxiality is increased. When mounting the cutter body 2 on the cutter mounting portion 7, the flange 12 of the cutter body 1 is fitted to the step portion 11 of the cutter mounting portion 7, and the four key grooves 17 are fitted to the key members 14, respectively. By letting
The cutter body 2 is attached so that the axis thereof coincides with the axis of the mounting portion 7. Flange 12 and step 11 of cutter body 2
In the and, substantially half-moon shaped concave portions 18a and 18b (which collectively constitute the circular concave portion 18) are formed, and a clamper 9 having a substantially half-moon shaped notch is rotatably attached to the circular concave portion 18. By rotating the clamper 9 on the concave portion 18a of the flange 12, the cutter body 2
Is firmly fixed to the cutter attachment portion 7, and the attachment of the pin mirror cutter 1 to the processing machine 6 is completed.

[0005]

If the mounting mechanism of the pin mirror cutter 1 has the structure as described above, when the cutter body 2 is mounted on the cutter mounting portion 7, the key groove 17 and the key member 14 are separated from each other. Since the dimensions are substantially the same and the tolerance is small, the fitting is tight, and there is a problem that it takes time to attach and detach the key groove 17 to and from the key member 14. In particular, since these cutters are arranged on the cross line so that the cutter body 2 is coaxial with the cutter attachment portion 7, there is a drawback that it is more difficult to attach and detach. Further, when the cutter needs to be replaced due to chipping during cutting, the key member 14 is expanded due to heat generated during cutting, while the spare cutter 1 is in a normal temperature state, so There is also the drawback that it is difficult to fit 17 into the expanded key member 14.
Further, when it is used for a long period of time, the above-described attachment / detachment and replacement work of the cutter body 2 are repeated, so that the key member 14 and the key groove 17 are worn or thermally deformed, which causes rattling in the fitted state. As a result, the coaxiality with respect to the cutter mounting portion 7 of the cutter body 2 is lost, and there is a drawback in that the workpiece cannot be accurately processed into a perfect circle.

In view of the above problems, the present invention provides a pin mirror cutter mounting mechanism in which the cutter body has high rigidity, is easily and precisely attached to and detached from the cutter mounting portion, and has high mounting strength. With the goal.

[0007]

In the mounting mechanism of a pin mirror cutter according to the present invention, a cutter body, which has an annular shape and in which cutting edges are arranged on an inner peripheral portion, is attached to and detached from a cutter mounting portion which is rotationally driven by a processing machine. In a mounting mechanism of a pin mirror cutter that is mounted so that it can be integrally rotated by a key member and a key groove, the key groove is a concave groove having a substantially trapezoidal cross section, and the key member is fitted into the key groove. It is characterized in that a fitting portion having a substantially trapezoidal cross section is formed, and at least respective surfaces of the fitting portion of the key member located rearward in the rotation direction and the key groove are inclined surfaces. The key groove and the key member are respectively formed on the flange of the cutter body and on the mating surface side of the step of the cutter mounting portion. The respective facing surfaces of the fitting portion of the key member and the key groove located forward in the rotation direction are inclined surfaces that are inclined in the opposite direction to the surfaces of the fitting portion of the key member located rearward in the rotation direction and the key groove. May be. Further, the respective facing surfaces of the fitting portion of the key member and the key groove located forward in the rotation direction may be formed orthogonally to the rotation direction.

[0008]

When the cutter body is mounted on the cutter mounting portion, the mating portions of the key member and the key grooves are brought into contact with each other to guide the mating, and the key member and the key groove are positioned in the rotational direction. When both side surfaces come into contact with each other and are positioned, the cutter body and the cutter mounting portion are aligned with each other in this state,
Easy to install and remove. Further, since the key groove is a concave groove and the cutter body and the cutter mounting portion are fitted to each other, the rigidity and the mounting strength of the cutter body are high, and chatter vibration can be suppressed. Also, when the cutter body is mounted on the cutter mounting part, the flange of the cutter body and the step part of the cutter mounting part make surface contact with each other on the mating surface, and the key member and the key groove are fitted on this mating surface side. Therefore, the mounting strength of both is high and they are parallel to each other, and chatter vibration can be prevented.
Further, since the mating portions of the key members located on the front side and the rear side in the rotation direction and the facing surfaces of the key grooves are inclined surfaces, the attachment and detachment are facilitated, and the cutter body is replaced during cutting. Even in this case, the key groove of the spare cutter body is surely fitted to the thermally expanded key member to perform centering. Since the surfaces of the fitting portion of the key member and the key groove located in the front in the rotation direction are formed orthogonal to the rotation direction, the transmission of the rotation torque to the cutter body is further ensured.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to FIGS.
However, the same reference numerals are used for the same parts or members as those of the above-described conventional technique, and the description thereof will be omitted. FIG.
2 is a partial plan view of the pin mirror cutter, FIG. 2 is a sectional view showing a fitted state of the key groove and the key member, FIG. 3 is a plan view of the key member fixed to the cutter mounting portion, and FIG. 4 is the key shown in FIG. It is a schematic side view of a member. In FIG. 1 and FIG. 2, four key grooves 20 are opened in the outer peripheral edge of the flange 12 on the outer peripheral portion of the pin mirror cutter 1 in the cross direction (that is, at intervals of 90 °) in a plan view of the cutter body 2 and are recessed. It is formed as a groove (only one is shown in the figure). The key groove 20 has a substantially trapezoidal cross section parallel to the axis of the cutter body 2 and is formed on the mating surface 12a side that comes into surface contact with the stepped portion 11 of the flange 12, and has an opening on the mating surface 12a side of the trapezoidal cross section. The portion 20a is formed wider than the bottom surface 20b (see FIG. 2). Further, the two inclined surfaces 20c and 20d adjacent to the opening 20a and the bottom surface 20b of the key groove 20 are formed so as to be inclined at the same angle in opposite directions. This inclined surface 20
The inclination angles of c and 20d are preferably more than 0 ° and within 45 ° with respect to the axial direction. Keyway 20
A recessed portion 21 is arranged in the innermost portion of the parallel to the axis.

In FIGS. 3 and 4, the key members 22 are fitted in the concave fitting portions 13 of the cutter mounting portion 7 and fixed by the screws 15. In this key member 22, at least the fitting portion 23 in the upper region protruding from the wall surface 11a facing the center side in the radial direction of the step portion 11 and the mating surface 11b and fitted into the key groove 20 has substantially the same size as the key groove 20. Has a substantially trapezoidal cross section, and in the fitting portion 23 of this key member 22, a trapezoidal bottom portion 23 (which is substantially flush with the step portion 11)
The width a is wider than the upper surface 23b. Moreover, the pair of side surfaces
A pair of inclined side surfaces (inclined surfaces) 23 having an inclination angle corresponding to the pair of inclined surfaces 20c and 20d of the key groove 20 described above.
c and 23d. In addition, the fitting portion 23 of the key member 22 is fitted to the key groove 20 and the upper surface 23 thereof.
A slight gap c is formed between b and the bottom surface 20b. Further, as shown in FIG. 2, the cutter body 2 and the cutter mounting portion 7 are mounted, and the key groove 20 and the key member 2 are attached.
The mating surface 12a of the flange 12 of the cutter body 2 and the stepped portion 1 of the cutter mounting portion 7 with the fitting portion 23 of the cutter 2 fitted together.
The mating surface 11b of No. 1 is in surface contact.

Since the pin mirror cutter 1 according to the present embodiment is constructed as described above, when the cutter body 2 is attached to the cutter attaching portion 7, the pin attaching portion 1 is attached to the cutter attaching portion 7 at 90 degrees.
The flange 12 of the cutter body 2 is joined to the stepped portion 11 of the cutter attachment portion 7 so that the key groove 20 is fitted to the fitting portions 23 of the key members 22 arranged at intervals of °. In this case, on the pair of inclined surfaces 20c and 20d of the key groove 20,
The pair of inclined side surfaces 23c and 23d of the key member 22 are fitted to face each other. Moreover, the mating surface 12a of the flange 12 of the cutter body 2 and the mating surface 11b of the step 11 of the cutter mounting portion 7 are in surface contact with each other. In this state, the flange 12
The clamper 19 may be rotated and fixed so as to be positioned on the concave portion 18a. In this manner, the axis line of the cutter mounting portion 7 (main shaft) and the axis line of the cutter body 2 can be surely aligned at the time of mounting, and the fitting portion 23 of the key member 22 and the key groove 20 are substantially trapezoidal in cross section. Because we have
The cutter body 2 can be easily and easily attached to and detached from the cutter attachment portion 7. Furthermore, since the key groove 20 is a recessed groove that does not penetrate, the key groove 20 itself has high rigidity,
Since it is formed on the mating surface 12a side of the flange 12 and the key member 22 is also provided on the mating surface 11b side of the stepped portion 11, the joining strength in the mounted state is high.

Further, when the cutter body 2 is replaced during cutting, the key groove 20 of the cutter body 2 and the key member 22 of the cutter mounting portion 7 in the fitted state are in an expanded state due to heat generated during cutting, The spare cutter body 2 is at room temperature. Even in this case, since the fitting portion 23 of the key groove 20 and the key member 22 has a substantially trapezoidal cross section, the key groove 20 of the cutter body 2 in use can be easily removed. Then, the key groove 20 of the spare cutter body 2 smoothly moves to the key member 22.
Will be fitted with. Moreover, the dimensional deviation due to the thermal expansion of the key member 22 can be absorbed, and the pair of inclined surfaces 20c, 2c
0d is brought into surface contact with the inclined side surfaces 23c, 23d and locked,
Each mating surface 12a between the cutter body 2 and the cutter mounting portion 7,
11b makes surface contact with each other, so that firm fitting and centering can be reliably performed. Further, even if the key member 22 and the key groove 20 are worn or thermally deformed due to long-term use, the work piece can be precisely processed without rattling in the fitted state. still,
The two inclined surfaces 20c and 20d of the key groove 20 and the key member 2
It goes without saying that the two inclined side surfaces 23c and 23d of the second fitting portion 23 do not have to be at the same angle with each other, and may have different angles.

As described above, according to this embodiment, the key member 22 and the key groove 20 can be easily and precisely attached and detached, and the core of the cutter body 2 and the cutter attachment portion 7 can be surely made. Can be matched. Moreover, since the key groove 20 is a concave groove, the rigidity of the cutter body 2 itself is high,
Moreover, since the key groove 20 and the key member 22 are respectively formed on the mating surface sides of the flange 12 and the stepped portion 11, the respective surface contacts at the time of fitting are reliable, the joining strength is high, and chatter vibration during cutting is prevented. it can. Further, even if the cutter body is replaced during cutting, the cutter body can be easily removed and the key groove 20 of the spare cutter body 2 can be easily and precisely mounted by absorbing the dimensional deviation due to thermal expansion. Since rattling does not easily occur even when used, the work piece can be cut precisely.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described below. 5 is a plan view of a key groove portion of the cutter body, FIG. 6 is a sectional view showing a fitted state of the key groove and the key member,
FIG. 3 is a plan view of the key member fixed to the cutter mounting portion. In this embodiment, instead of the key groove 20 of the first embodiment, key grooves 24 as shown in FIGS. 5 and 6 are formed on the flange 12 of the cutter body 2 at equal intervals of 90 °. The key groove 24 has a concave groove of a substantially trapezoidal cross section formed on the mating surface 12a side as in the first embodiment, but with respect to the opening 24a and the bottom surface 24b on the mating surface 12a side. The side surface of the cutter body 2 located on the front side in the rotation direction (see arrow A) forms a flat surface 24c orthogonal to the rotation direction, and the side surface on the rear side in the rotation direction is an inclined surface 24d.

On the other hand, in the key member 25 of the cutter mounting portion 7 shown in FIGS. 6 and 7, at least the wall surface 11a of the step portion 11 facing the radial center and the fitting portion 26 projecting from the mating surface 11b are provided. Although it has a trapezoidal cross section, a side face located in front of the wide bottom part 26a and a narrow top face 26b facing each other in the rotation direction (see the arrow A) forms a reference surface 26c orthogonal to the rotation direction. None, the inclined side surface 26d (inclined surface) located rearward in the rotational direction is the keyway 24
The inclined surface 24d is inclined at the same angle.
Moreover, the trapezoidal cross section of the fitting portion 26 of the key member 25 is formed to have substantially the same size as the trapezoidal cross section of the key groove 24, and in the fitted state of both, the bottom surface 24b of the recessed groove 24 and the fitting portion 26 are formed. A slight gap c is formed between the upper surface 26b and the upper surface 26b.

Therefore, in the second embodiment, when the cutter body 2 is mounted on the cutter mounting portion 7, the key groove 24 is fitted into the fitting portion 26 of the key member 25.
Is locked while the inclined surface 24d is guided by the inclined side surface 26d of the fitting portion 26 to fit each other and the flat surface 24c of the key groove 24 is in contact with the reference surface 25c of the key member 25. In this state, the cutter body 2 has the cutter mounting portion 7
It means that it has been precisely centered. Further, in this state, when the cutter body 2 is fixed to the cutter mounting portion 7 by the clamper 19 and integrally rotated, the rotation (cutting) torque on the side of the cutter mounting portion 7 of the processing machine 6 is transmitted to the cutter body 2. The reference surface 2 of the key member 25 whose portion is perpendicular to the rotation direction
6c and the flat surface 24c of the key groove 24, the torque transmission is more reliable and the transmission force is higher than in the first embodiment.

As described above, according to the second embodiment, in addition to the effect of the first embodiment, the centering of the cutter body 2 and the cutter mounting portion 7 becomes more precise, and the cutter mounting portion 7 becomes more precise. The rotating torque on the side can be reliably and strongly transmitted to the cutter body 2.

In each of the above embodiments, the key members 22, 2 are
5 has a trapezoidal cross section of the fitting portions 23 and 26, which are the upper regions, but the region for fitting with the key groove may be formed into a trapezoidal shape with the entire cross section of the key member. Part 1
It suffices if it is located on one mating surface 11b. Further, the key members 22 and 25 and the key grooves 20 and 24 described above do not need to have a strict trapezoidal cross section, and for example, the inclined surface and the inclined side surface have inclined surfaces of two or more steps, respectively. It may be formed. Further, in each of the above-described embodiments, four key members and four key grooves are provided. However, the present invention is not limited to this, and another suitable number, for example, three at equal intervals, may be provided as long as accurate centering is possible. You may do it. Further, in each of the above-described embodiments, the key member is fixed to the cutter mounting portion 7 and the key groove is formed in the cutter body 2. On the contrary, the key groove is fixed to the cutter mounting portion 7 and the key member is fixed. May be formed on the cutter body 2.

[0019]

As described above, in the attachment mechanism of the pin mirror cutter according to the present invention, the key groove is a concave groove having a substantially trapezoidal cross section, and the key member has a substantially trapezoidal cross section to fit into the key groove. Since the mating portion is formed and at least the respective surfaces of the key member and the key groove, which are located at the rear in the rotational direction, facing each other are inclined surfaces, the key member and the key groove can be easily and accurately attached and detached. Therefore, the center of the cutter body and the cutter mounting portion can be surely aligned. Moreover, since the key groove is a concave groove, the rigidity is high, and the strength and rigidity in the fitted state of the cutter body and the cutter mounting portion are high, and chatter vibration can be suppressed. Also, even if the cutter body is replaced during cutting,
In addition to being easy to remove, it can absorb the dimensional deviation due to the thermal expansion of the key member, and can easily and precisely install the key groove of the spare cutter body to align the core, and even after use over time, rattling etc. Since it is unlikely to occur, the work piece can be cut precisely. Further, since the key groove and the key member are respectively provided on the mating surface side of the flange of the cutter body and the step portion of the cutter mounting portion, the mounting strength as the cutter is high and chatter vibration can be suppressed. Further, since the facing surfaces of the key member and the key groove located in the front in the rotational direction are inclined surfaces that are inclined in the opposite direction to the surfaces of the key member and the key groove located in the rear in the rotational direction, respectively. It becomes easier to attach and detach the key groove and the key groove. Further, since the facing surfaces of the key member and the key groove located in the front in the rotation direction are formed orthogonally to the rotation direction, in addition to the above-mentioned effect, the centering of the cutter body and the cutter mounting portion is performed. It becomes even more precise, and the rotation torque of the cutter attachment part can be reliably and strongly transmitted to the cutter body.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part of a pin mirror cutter according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a fitted state of a key groove and a key member.

FIG. 3 is a plan view of a key member portion of a cutter attachment portion.

FIG. 4 is a schematic side view of the key member and the cutter attachment portion of FIG.

FIG. 5 is a plan view of a key groove portion of a cutter body of a pin mirror cutter according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a fitted state of a key groove and a key member.

FIG. 7 is a plan view of a key member according to a second embodiment.

FIG. 8 is a plan view of a main part of a conventional pin mirror cutter.

FIG. 9 is a schematic configuration diagram of a processing machine to which a pin mirror cutter is attached.

10 is a cross-sectional view taken along line XX of FIG.

FIG. 11 is a side view of a key groove portion of the cutter body.

[Explanation of symbols]

 1 Pin Mirror Cutter 2 Cutter Main Body 7 Cutter Mounting Part 11 Step Part 12 Flange 11b, 12a Mating Surface 20, 24 Key Groove 20c, 20d, 24d Sloping Surface 22, 25 Key Member 23, 26 Fitting Part 23c, 23d, 26d Sloping Side surface 24c Flat surface 26c Reference surface

Claims (4)

[Claims] 1. A cutter body, which has an annular shape and in which cutting blades are arranged on an inner peripheral portion, is detachably mounted on a cutter mounting portion of a processing machine which is rotationally driven, and integrally rotates by a key member and a key groove. In the attachment mechanism of the pin mirror cutter connected as described above, the key groove is a concave groove having a substantially trapezoidal cross section, and the key member is formed with a fitting portion having a substantially trapezoidal cross section that fits into the key groove,
A mounting mechanism for a pin mirror cutter, characterized in that at least the mating portion of the key member located rearward in the rotational direction and the opposing surfaces of the key groove are inclined surfaces. 2. The pin mirror cutter according to claim 1, wherein the key member and the key groove are provided on respective mating surface sides of the step portion of the cutter attachment portion and the flange of the cutter body. Attachment mechanism. 3. The mating portion of the key member located in the front in the rotational direction and the facing surfaces of the key groove are opposite to the mating portion of the key member located in the rear in the rotational direction and the surface of the key groove. The mounting mechanism for a pin mirror cutter according to claim 1 or 2, wherein the mounting mechanism is an inclined surface that inclines in a direction. 4. The mating portion of the key member located in the front in the rotational direction and the facing surfaces of the key groove are formed to be orthogonal to the rotational direction. Pin mirror cutter mounting mechanism.