JP2861828B2 - Pin mirror cutter mounting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter mounting mechanism for removing an internal pin mirror cutter for machining a crankshaft smoothly and advantageously in terms of rigidity with respect to an adapter mounted on a processing machine. .

[0002]

2. Description of the Related Art FIG.
Shown in In the drawing, 1 is a pin mirror cutter having a cutting blade tip 2 mounted on the inner peripheral portion, 3 is an adapter for mounting the cutter 1, 4 is a key for centering and transmitting torque of the cutter, 5 is a half-month presser foot 5a and its center. The adapter 3 is fixed to a spindle 7 of a processing machine with a bolt 8.

[0003] A pin mirror cutter 1 is provided with a flange 1 provided on the outer periphery.
a is fitted into a seat groove 3a provided on the inner peripheral end surface of the adapter, the centering is performed by four keys 4 attached to the adapter, and the adapter is fixed to the adapter 3 by a clamper 5.

The clamper 5 locks the crescent foot 5a on the end face of the cutter and tightens the clamp bolt 5b in this state. When removing the cutter, the bolt 5b is loosened to rotate the crescent presser 5a half a turn. Disengage the cutter.

[0005] The key 4 and the keyway 6 have a division error of four places within 0.02 mm for high-precision centering of the cutter.
Their width is also controlled to within a hundred percent tolerance.

The workability of clamping and unclamping by manipulating any number of bolts when attaching and detaching the cutter is inferior in workability. There has been proposed a locking member which advances and retreats in the radial direction of the cutter in conjunction with the rotation of the fixing member and presses the cutter against the seat of the adapter to maintain the connected state.

[0007]

The mounting mechanism shown in FIG.
Since the key 4 and the key groove 6 are fitted with high precision, it is necessary to remove the cutter so as not to cause a twist at this portion, and it is not easy to remove the cutter from the beginning. Since it expands due to the cutting heat and fits tightly with the key groove 6, it cannot be smoothly attached or detached.

Further, since a flange 1a is provided on the outer periphery of the cutter and the flange is housed in the seat groove 3a of the adapter,
The cutter body thickness T of the flange portion shown in FIG. 4 (b) is reduced, so that the overall rigidity of the cutter is reduced, and thermal expansion is more likely to occur, so that attachment and detachment are more difficult. I have.

The mounting apparatus disclosed in Japanese Patent Application Laid-Open No. 6-143018 also has a structure in which the outer peripheral wall of the cutter is thinned and this portion is accommodated in a corresponding seat groove of the adapter, and therefore, the overall rigidity of the cutter is reduced. In addition, there is a problem that the lock mechanism for maintaining the connection state of the hearth coupling is convenient, but the structure is complicated and causes an increase in cost.

Therefore, the present invention provides a pin mirror cutter which has a function of centering the cutter with high precision to eliminate the problem of deterioration in detachability due to thermal expansion, and to increase the overall rigidity of the cutter. It is intended to provide an attachment mechanism.

[0011]

In order to solve the above-mentioned problems, according to the present invention, a plurality of splines are provided on the outer periphery of the pin mirror cutter in place of the conventional flange, and the inner periphery of the adapter is provided with a conventional spline. A spline groove is provided in place of the seat groove corresponding to the spline, and the spline and the spline groove are tapered at a taper angle of 5 ° to 60 ° such that the front side in the cutter insertion direction with respect to the adapter gradually narrows. By doing so, a configuration was also adopted in which the straight keys and key grooves conventionally provided were also omitted.

The spline and the spline groove preferably have a taper angle of 5 ° to 60 °, more preferably 25 ° to 40 °.

As the clamper for fixing the pin mirror cutter to the adapter to maintain the fitted state, the clamper comprising the above-mentioned half-month presser foot and clamp bolt, or the outer peripheral surface of the spline fitted in the spline groove may be used. A wedge that is press-fitted between the wedge and an adapter, a wedge-propelling screw having one end screwed to the adapter and the other end of the reverse screw screwed to the wedge can be suitably used.

[0014]

When at least three splines are arranged at equal intervals in the circumferential direction and these splines are tapered into spline grooves at corresponding positions, the centripetal force for moving the splines to the center of the spline grooves at each fitting portion is reduced. This causes the cutter to be centered with high precision without tilting.

[0015] A spline is a kind of key.
In the present invention, since the spline and the spline groove are taper-fitted, when the spline thermally expands, a component force for pushing the spline out of the groove is generated in the taper fitting portion, and as the spline comes off, the gap between the spline and the spline groove is increased. Enlargement and, therefore, no tight fitting immediately after cutting.

Furthermore, if the spline and spline groove are fitted, it is not necessary to reduce the thickness of the outer peripheral portion of the cutter, and the thickness can be made the same as the adapter thickness to increase the overall rigidity of the cutter. In addition, if the rigidity is the same as the conventional one, it is possible to reduce the thickness of the cutter and reduce the weight.

If the taper angle of the spline and the spline groove is too small, it will be close to that of a conventional key having a taper angle of 0 °, so that the fitting is tight and the effect of improving the detachability is diminished. Since the cutter may be too loose and the cutter may come off, it is better to set the numerical value in the range described above.

Further, the clamper of the type in which the wedge is pressed into the outer periphery of the spline can omit the seat on the cutter side for locking the half-month presser foot, and the effect of maintaining the rigidity of the cutter is higher.

[0019]

FIG. 1 shows an example of a mounting mechanism according to the present invention.
In the figure, reference numeral 1 denotes a pin mirror cutter having a cutting blade tip 2 mounted on an inner peripheral portion. On the outer periphery of the cutter, a large number of splines 9 shown in detail in FIG. 2 are provided at a constant pitch in the circumferential direction. The adapter 3 has the same number of spline grooves 10 as the number of splines for fitting the splines 9 to the inner peripheral portion thereof.

The spline 9 has a width W shown in FIG.
There, W ₁ in the cutter insertion direction front end with respect to the adapter 3
An angle α (see FIGS. 1B and 2B) is tapered in the cutter thickness direction so that (W ₁ <W).
The spline groove 10 is also tapered at the same angle corresponding to this. Therefore, the spline 9 fitted in the spline groove 10 is positioned at the center of the spline groove 10 as shown in FIG. 1B by the function of the tapered surface, and this positioning is performed for each spline. Centered exactly on the center of 3.

Reference numeral 5 in FIG. 1A denotes a clamper for fixing the cutter 1 after fitting and centering to the adapter 3. This clamper applies an appropriate frictional force between the semi-monthly presser foot 5a and the clamp bolt 5b passing through the center thereof.
When b is rotated in the loosening direction or the tightening direction, the half-month presser foot 5a rotates together with the stopper 5c to a position where it is prevented from rotating. Thereafter, when the rotation operation of the bolt is continued,
The presser foot slips and only the bolt rotates. The clamper 5 is provided with a seat groove 11 on the end face of the spline 9 to lock the crescent foot 5a therein.
In the case of the clamper 12, the seat groove 11 is unnecessary, and the rigidity of the cutter can be further increased. Further, if the clamper 12 is used, the spline may be fitted into any groove, so that there is no restriction on the direction in which the cutter is assembled.

The clamper 12 shown in FIG.
A wedge groove is provided between the outer peripheral surface of the adapter and the adapter 3, and a wedge 12a is inserted therein. A screw (so-called W screw) 12b having one end of the wedge 12a screwed into the adapter 3 and the other end of the reverse screw screwed into the wedge 12a. Spline 9
Is strongly tightened.

The clamper for fixing the pin mirror cutter 1 is desirably the one shown as an example because it has a simple structure and is easy to operate, but is not particularly limited to this.

[0024]

As described above, the cutter mounting mechanism of the present invention has a structure in which a tapered spline is fitted into a spline groove, and the support of the pin mirror cutter by the adapter and the centering of the catalyzer are performed by the spline fitting portion. It is possible to attach and detach the pin mirror cutter after obtaining high centering accuracy without the fitting being tight due to thermal expansion and the fitting part being twisted when the cutter is tilted during removal. It can be facilitated.

The thickness of the outer peripheral portion of the cutter is
Since the thickness is made the same, the overall rigidity of the cutter can be increased to improve the durability, or the thickness of the cutter can be reduced to reduce the weight. Its light weight makes attachment and detachment easier, and the work time can be greatly reduced.

[Brief description of the drawings]

FIG. 1A is a front view showing an example of a cutter mounting mechanism according to the present invention in use, and FIG. 1B is a cross-sectional view taken along the line AA in FIG.

2A is a front view showing a part of the cutter shown in FIG. 1, and FIG. 2B is a perspective view of the cutter.

FIG. 3A is a front view showing another example of the clamper. FIG. 3B is a cross-sectional view taken along the line BB of FIG.

FIG. 4A is a front view of a cutter and an adapter having a conventional cutter mounting mechanism. FIG. 4B is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pin mirror cutter 2 Cutting edge tip 3 Adapter 5 Clamper 5a Half moon presser 5b Clamp bolt 5c Stopper 9 Spline 10 Spline groove 11 Seat groove 12 Clamper 12a Wedge 12b Wedge propulsion screw W Spline end width W ₁ Other spline End width α Taper angle

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-246523 (JP, A) JP-A-62-2535 (JP, U) JP-A-4-17339 (JP, U) Jiko 61- 25950 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) B23C 5/12 B23C 3/06

Claims (2)

(57) [Claims] 1. A pin mirror cutter mounting mechanism in which an annular pin mirror cutter having a cutting blade on an inner peripheral portion is detachably fitted to an adapter and fixed to the adapter by a clamper. The thickness is the same as the thickness of the adapter, two or more splines at equal intervals in the circumferential direction are provided on the outer periphery of the pin mirror cutter, and spline grooves corresponding to the splines are provided on the inner periphery of the adapter, respectively.
A taper angle of 5 ° to which the front side of the spline and the spline groove in the cutter insertion direction with respect to the adapter becomes gradually narrower.
A pin mirror cutter mounting mechanism, characterized in that both are fitted with a taper of 60 °. 2. A wedge for press-fitting the clamper between an outer peripheral surface of a spline fitted in a spline groove and an adapter, one end of the clamper is screwed on the adapter, and the other end of the reverse screw is screwed on the wedge. 2. A wedge-propelling screw according to claim 1.
The mounting mechanism of the pin mirror cutter described.