JPH09253917A - Inserted milling cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly fix a cutting edge body to a milling cutter body with a simple mechanism without changing the cutting radius even when the cutting edge body is polished. SOLUTION: A milling cutter body 12 is provided on the outer peripheral part with a plurality of cutter grooves 13 and composed of a rear seat 30 received in the cutter groove, a cutting edge body 25 pressed fixely against a cutting edge body addutting surface 14 of the cutter groove by the rear seat and a fixing member 40 for fixing the rear seat. A means for correcting the change of the cutting radius when the face of the cutting edge body is polished is composed of an engaging inclined surface 18 facing the inner periphery of the cutter groove and an inclined surface 35 slidably contacting the rear seat and formed on the rear seat to abut against the inclined surface 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a milling cutter used for cutting wood, wood-based materials, synthetic resin-based materials, soft metal materials or materials similar thereto, and more specifically, replaceable blade type (planting blade type) In addition, the present invention relates to a milling cutter in which the cutting radius hardly changes even if the replacement blade is re-polished and then attached again.

[0002]

2. Description of the Related Art Conventionally, there have been methods such as brazing, screwing, and a method of fixing a blade of a milling cutter of this kind to a main body. In brazing, the change in cutting radius must be corrected by adjusting the movement of the machine axis. Also,
It took time and labor to adjust the cutting radius when fixing the blade with a backing plate or the like. Therefore, a milling cutter has been developed which has a cutting radius which does not change even if the blade is polished.
There is No. 13 publication.

As shown in FIG. 8 (which shows a part of the assembly of the blade supporting disk and the finger cutter), the one disclosed in this publication has a blade supporting circle of approximately the same thickness as one finger cutter 218. A blade fitting groove 213 and a spring fitting groove 214, which are slanted in the rotation direction, are continuously cut from the peripheral edge 212 of the plate 211, and a finger cutter 218 protruding from the peripheral edge 212 is removed in the blade fitting groove 213 in the thickness direction. It is freely fitted, and a sliding slope 217 of about 45 degrees is formed between the outer peripheral side 215 and the inner peripheral side 216 of the rear side edge of the fitting groove 213 in the rotation direction, and the finger cutter 218 has the inside of the sliding slope 217. There is provided a moving surface 219 of about 45 degrees which is engaged with the finger cutter 218. The finger cutter 218 has a shape tightly fitted to the tool fitting groove 213 except for the portion protruding from the peripheral edge 212, and sharpening grinding is performed on the front edge in the rotation direction. Providing a scooping surface 220 to apply, spring fitting Groove 214
The spring 221 fitted to the cutter is hooked on the lower edge of the cutter 218, and the rake face 220 is ground, and the decrease in the amount of protrusion is absorbed by the sliding of the cutter 218 at the slide slope 217, and the squeeze face 220 is ground. Instead, the tip of the cutter 218 is configured to project to substantially the same position. Another configuration is shown in FIGS. 9 (a) and 9 (b), in which the flank 232 of the blade 229 is provided on the outer peripheral side of the milling cutter 225 shown in FIG. A guide rail 227 is formed in parallel, and a blade 229 is formed on this guide rail 227.
A guide plate 228 to which is attached is slidably attached, and a long hole 230 is formed in the guide plate 228. Further, the blade body 229 is a blade body rake surface 233.
At the abutment surface 234 of the milling cutter body 226. Grind the rake face 233 to reduce the amount of protrusion along the guide rail 227.
By moving 8 to bring the squeeze surface 233 of the blade 229 into contact with the inclined surface 234, the cutting edge is positioned on the cutting circle D, and is fixed via the set bolt 231 from the long hole 230 of the guide plate 228. It is configured.

[0004]

However, in the former one, when the squeeze surface 220 of the cutter 218 is ground and then the cutter 218 is fitted into the blade fitting groove 213, the fitting groove 213 Front edge 215 on the outer peripheral side of the rear edge in the direction of rotation
The cutter 218 is positioned by the spring 221 fitted in the spring fitting groove 214 of the fitting groove 213 in a state where a gap Δt is formed between the cutter 218 and the trailing edge 218a of the cutter 218. Further, since the positioning reference of the cutter 218 is the front side edge of the blade fitting groove 213 in the rotational direction, there is a problem that the finger cutter 218 moves rearward in the rotational direction where a cutting force is applied during use and the cutting diameter is reduced. Also, in the latter case, when a cutting force is applied to the blade body 229, the blade body 229 is set and fixed in the elongated hole portion 230, so that there is a problem that the cutting diameter is reduced by moving backward in the rotation direction in the drawing. The present invention has been made in order to solve the above conventional problems, a simple mechanism, which can be firmly fixed to the milling body, the cutting radius is almost unchanged even if the blade body is polished. The purpose is to provide a formula milling machine.

[0005]

SUMMARY OF THE INVENTION In order to solve the above technical problems, the present invention is directed to a first aspect of the present invention, in which a plurality of blade grooves are provided on the outer peripheral portion of a milling cutter body, and a back seat which is accommodated in the blade grooves. And a blade body that is pressed and fixed to the rear of the blade groove by the back seat in the direction of rotation, and a means for fixing the back seat to the milling cutter body.The cutting radius when the blade rake face is polished The second aspect of the present invention is that the means for compensating for the change in the outer diameter of the milling cutter main body is composed of an inclined surface facing the inner circumference of the blade groove and an inclined surface formed on the backing seat abutting the inclined surface. By providing a plurality of blade grooves in the part, the back seat accommodated in the blade groove, the blade body pressed by the back seat to the rear of the blade groove in the rotation direction, and the means for fixing the back seat to the milling cutter body. Of the cutting radius when the blade rake face is polished. The means for correcting the deterioration is formed on the front side in the rotation direction of the blade body and the first correcting means composed of the inclined surface facing the inner circumference of the blade groove and the inclined surface formed on the back seat that abuts against the inclined surface. The third invention comprises means for fixing the back seat to the milling cutter main body, which is composed of both the inclined surface and the second correction means composed of the inclined surface formed on the back seat that contacts the inclined surface. Since it is a cam, it can be applied to a blade cutter having a thin wall thickness, for example, a finger cutter. The fourth invention is a correction amount for a change in cutting radius caused by a difference in the radial position of the blade. The difference can be corrected by changing the outside diameter clearance angle and the cutting edge angle of the blade body depending on the radial position, and thus can be effectively applied to the forming cutter. Compared to a conventional milling machine with an adjusting mechanism, the blade body can be directly fixed to the rear side in the rotational direction where force is applied when the milling machine is used, and the fixation can be made stronger. As for the blade edge accuracy, as shown in FIG. 2, when the initial blade edge position is P, the blade edge position is Q when the blade rake face 27 is polished by the polishing amount a and the polishing amount is not corrected in the conventional technique.
The cutting radius displacement is q. Here, the first and second
According to the configuration of the invention described above, the locus indicating the cutting edge position retreated by polishing is, for example, the cutting circle D at the initial cutting edge position P.
The backing plate can be moved at an angle θ with respect to the direction perpendicular to the rear surface in the rotational direction of the blade groove so that the tangent line L of
As a result, for example, the cutting edge Q of the blade becomes the point U on the tangent line L, and the displacement of the cutting radius becomes u, so that the amount corresponding to the displacement of the cutting radius when the blade is polished can be projected. The accuracy of is comparable to the machining tolerance of the milling machine itself and has almost no effect on use. Further, as illustrated in FIG. 3, by setting the angle θ so that the locus L ″ is such that the cutting edge position P ″ during final use is located on the cutting circle D at the initial cutting edge position P, the initial cutting is performed. The radius and the cutting radius at the end use can be the same. Similarly, this angle θ can be adjusted so that the maximum and minimum values of the cutting radius between initial and final use fall within a convenient tolerance range.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 3 show a first embodiment of the present invention, in which FIG. ) 11 is a partial side view of the milling body 12 assembled to the milling body 12 in a sectional view.
1 comprises a milling cutter body 12, a blade 25, a backing plate 30, and a fixing member 40. The milling body 12 has a cutting edge diameter of 160 mm, and the milling body 12 is provided on the outer circumference of the milling body 12 at intervals of a central angle of 90 degrees, for example.
A blade groove 13 for accommodating the back seat 30 and the fixing member 40 is formed. As shown in the figure, the blade groove 13 has a blade contact surface 14 (rear surface in the rotation direction) and a wall surface 15 that is the front surface in the rotation direction, which are arranged in parallel with each other at a predetermined interval. The contact surface 14 is formed to be shorter than the wall surface 15, and an engaging convex portion 16 that protrudes into the blade groove 13 by a predetermined length and engages with the back seat 30 is formed on the lower end side thereof.

As shown in the figure, the engaging projection 16 has a predetermined angle .theta. [Tan .theta. = Tan (.beta. +. Gamma.) With respect to a line C1 perpendicular to the upper surface 17 of the blade contacting surface 14 and the blade contacting surface 14. )
-Tan γ] has an engaging inclined surface 18 inclined downward to the bottom surface 20 side, and an inclined surface 19 having a predetermined angle is formed at the base of the engaging convex portion 16. The inclined surface 19 and the wall surface 15 are formed. The bottom surface 2 including the horizontal portion 21 and the inclined portion 22 and the inclined surface 24 formed between the horizontal portion 21 and the inclined portion 22.
0 is formed and the tool groove 13 is formed in a substantially U shape,
A swallowing recess 23 into which the back seat projection 34 of the back seat 30 is inserted is formed between the inclined portion 22 and the engaging projection 16. The blade body 25, the back seat 30, and the fixing member 40 are integrally assembled and fixed to the tool groove 13 thus formed.

This blade 25 is formed into a trapezoidal shape in cross section and has upper and lower blade tips so that it can be used for cutting twice. This blade 25 has a blade contact surface of the blade groove 13. A vertical blade back surface 26 abutting on the blade 14 and a rake surface 27 are formed on the opposite side of the blade back surface 26, and an engaging portion for engaging and connecting with a back seat 30 is formed in a central portion of the rake surface 27. The recess 28 is provided as a recess. As shown in FIG. 2, the upper and lower edge shapes of the blade body 25 are formed to have, for example, a blade angle α (= 50 °), a blade clearance angle β (= 20 °), and a rake angle γ (= 20 °). ing. At this time, the angle θ of the engaging inclined surface 18 of the engaging convex portion 16 is θ = 25 ° 24 'from the above formula. FIG. 2
In the figure, O is the center of rotation of the milling cutter 11, P is the position of the cutting edge before polishing, D is a circle centered on the point O passing through the point P (grinding circle), and L is a straight line orthogonal to the line OP passing through the point P ( Tangent)
And 27 is a rake face.

Further, the back seat 30 is formed with a back seat rear surface 31 that abuts against the rake face 27 of the illustrated blade body 25 and a back seat front surface 32 that tilts forward at a predetermined angle. This back seat rear surface 31 is predetermined. The length is formed vertically and a step surface 33 is formed stepwise on the lower side thereof, and the tool groove 1 is formed below the step surface 33.
3 is a back seat sliding contact slanting surface 35 that slidably engages with the engaging slanting surface 18 of the engaging projection 16 formed on the lower portion of the blade contacting surface 14.
The back seat convex portion 34 having is formed. Further, a step recess 36 is formed at a predetermined position on the rear surface 31 of the back seat at a right angle to the back surface 31, and a spring member 37 having a predetermined spring pressure is formed in the step recess 36 at the depth end thereof with a pin. 38 and the rake face 2 of the blade 25 on the opening side.
A wedge member 39 that fits in a wedge shape with the engaging concave portion 28 that is recessed in 7 is elastically attached.

The fixed member 40 has a rearwardly inclined fixed rear surface 41 slidably contacting the back seat front surface 32 of the back seat 30 and a fixed front surface slidably contacting the wall surface 15 of the tool groove 13. 42 is formed, and a screw hole 43 passing vertically is screwed at a predetermined position between the both surfaces 41, 42.
An adjusting screw 44 is screwed into the. The upper part of the screw hole 43 is not threaded, and the adjusting screw 44 is prevented from jumping out of the screw hole 43 even if the adjusting screw 44 is turned too much. A minus groove that engages with the driver is cut in the head of the adjusting screw 44, and the driver can be inserted into the screw hole 43 that penetrates vertically from above.

The fixing member 40 thus provided is placed on the horizontal portion 21 of the bottom surface 20 of the tool groove 13 in a state where the adjusting screw 44 is screwed upward and the tip thereof is immersed in the screw hole 43. The fixed front surface 42 is brought into contact with the wall surface 15. Then, the wedge member 39 is brought into contact with the engaging recessed portion 28 of the blade body 25 in a state where the back seat protruding portion 34 of the backing seat 30 is inserted into the swallowing recessed portion 23 on the lower surface side of the engaging protruding portion 16 of the blade groove 13, The blade back surface 26 of the blade 25 is brought into contact with the blade contact surface 14 of the tool groove 13, and the back surface slide contact inclined surface 35 of the back seat convex portion 34 is provided on the engagement inclined surface 18 of the engagement convex portion 16. Abut. In this state, the fixing member 40
When the adjusting screw 44 is screwed, the fixing member 40 is moved upward, and the fixed rear surface 41 is brought into contact with the back seat front surface 32,
The blade body 25 presses the spring member 37, and the blade body contact surface 1
4 is slidably contacted to the back seat 30 and is integrally connected to the back seat 30. Then, by further advancing the adjusting screw 44, the backing plate 30 is slidably moved along the engaging inclined surface 18, and the blade body 25 has the blade back surface 26 along the blade contact surface 14. The blade tip of the blade body 25 is moved on the outer peripheral direction so as to be positioned on a predetermined tangent line L.

Now, the positional accuracy of the blade edge of the blade 25 with respect to the cutting circle D will be described. FIG. 2 is a conceptual diagram showing that when the initial blade edge position of the blade 25 is P, the blade 2
When the rake face 27 of No. 5 is polished by the polishing amount a, the blade edge position becomes Q and the displacement amount with respect to the cutting circle D becomes q when the polishing amount is not corrected. Here, in the milling cutter 11 of the present example, the cutting edge retreated by polishing the blade 25 is the cutting edge position Q.
Is the cutting circle D at the initial cutting edge position P.
So as to be located on the tangent line L of the back groove 30 of the cutting groove 13 to the engaging convex portion 16 below the blade contact surface 14 of the cutting groove 13. Since the blade 16 is provided so as to move along the engaging inclined surface 18 having the angle θ, the blade tip position of the blade body 25 becomes the position U on the tangent line L, and the displacement amount with respect to the cutting circle D = u. tan θ = tan (β
With the relationship of + γ) -tanγ, the cutting edge position after cutting is on the tangent line L.

With the above milling cutter 11, the cutting edge diameter is 160 m.
m, edge angle α = 50 °, edge clearance angle β = 20 °, rake angle γ = 20 °, total polishing amount after repeated polishing a = 2
When mm, u = 0.028mm for q = -0.855mm (a =
With 1 mm, q = -0.437 mm and u = 0.007 mm). this
The precision of 0.028 mm is comparable to the machining tolerance of the milling machine 11 itself and has almost no effect on use. The displacements q and u are

[Equation 1]

[Equation 2] More derived. Here, d is the diameter of the cutting circle D.

In the above description, the back seat 30 is perpendicular to the direction of the rear surface 14 in the rotational direction of the tool groove 13 so that the locus L of the cutting edge position moved by polishing becomes the tangent to the cutting circle D at the initial cutting edge position P. Is moved along the engaging inclined surface 18 having the angle θ, but as shown in FIG. 3, it is used on the cutting circle D at the initial cutting edge position P at the time of final use (a state in which re-polishing cannot be further performed. The angle θ may be set so that the locus L ″ is such that the blade edge position P ″ in FIG. For this purpose, tan θ = tan (β + γ) -tan (γ +
ψ) (here, ψ is an angle formed by the tangent line L of the cutting circle D and the locus L ″ at the cutting edge position P, and here is a value of ½ of the central angle between the cutting edge position P and the cutting edge position P ″. .). By setting θ to satisfy this relationship, the initial cutting radius and the cutting radius at the time of final use can be made the same. The maximum displacement amount in this case is u ′ = d / 2− (d / 2) × cos ψ when ½ of the total polishing amount a up to the last use is polished (ψ = 46 ′, θ = 24 In the case of 42 °), it is +0.006 mm in the above example. By adjusting the angle θ,
The maximum and minimum values of the cutting radius between the initial and final use can be set within the allowable range. In the above embodiment, the blade 25 is the back seat rear surface 3 of the back seat 30.
Although it is illustrated as being in contact with 1 and integrally connected via the wedge member 39, for example, instead of the wedge member 39, mutual engagement may be made with a screw / pin or unevenness.

Next, FIG. 4 shows a second embodiment of the present invention. This milling cutter 51 includes a milling cutter body 52 and a blade 61.
And a backing seat 65 and a fixing member 73.
This milling machine body 52 has a cutting edge diameter of 160 mm as in the above, and on the outer peripheral side of the milling machine body 52, the blade body 6 is provided at the interval position of the outer periphery center angle of 90 degrees as in the above.
1 and the back seat 65 and the blade groove 53 for accommodating the fixing member 73
Are formed. In the blade groove 53, a blade contact surface (rear surface in the rotation direction) 54 and a wall surface 55 that is the front surface in the rotation direction are provided in parallel with each other at a predetermined interval as shown in the drawing. The contact surface 54 is formed to be shorter than the wall surface 55, the escape recess 56 of the blade 61 is formed on the lower end side thereof, and the back surface convex portion 70 of the back seat 65 is swallowed between the contact surface 54 and the bottom surface 60. The recess 57 is formed, and the relief recess 56 and the swallow recess 5 are formed.
The engaging protrusion 58 is formed between the engaging protrusion 58 and the engaging protrusion 58.
A line C2 perpendicular to the blade contact surface 54 is formed on the swallowing recess 57 side of
On the other hand, the engaging inclined surface 59 is formed at a predetermined angle θa.

Further, the blade body 61 is formed in a substantially parallelogram cross-section and has upper and lower blade edges so that it can be used for cutting twice, and a rake face 62 is formed in the front and rear, and it is inclined vertically. A bald surface 62a is formed. Rake face 6 before and after this
A concave portion 63 for preventing the protrusion is formed at a predetermined position of 2. Further, the shape of the cutting edge is formed to have a cutting edge angle α (= 50 °), a cutting edge clearance angle β (= 20 °), and a rake angle γ (= 20 °), similarly to the blade body 25.

As shown in the figure, the back seat 65 is opposed to the blade contact surface 54 and contacts the rake face 62 of the blade 61. The back seat rear face 66 is inclined forward by a predetermined angle. A direction surface 67 is formed, and this back seat rear surface 66 is formed in a vertical shape with a predetermined length and has a line C2 perpendicular to the blade contact surface 54 at its lower end.
On the other hand, there is formed a blade body receiving inclined surface 68 which is inclined downward toward the blade body contact surface 54 at a predetermined angle θb. The angle formed by the parallelogram of the blade 61 is also set to θb, and the bald surface 62a and the inclined surface 68 are in surface contact with each other. A step surface 69 is formed at the end of the blade receiving inclined surface 68, and the engaging projection 5 is inserted into the swallowing recess 57 at the lower part of the step surface 69.
8 is formed with a back seat sliding contact slanted surface 71 that slidably engages with the engagement slanted surface 59 of the back seat 8. Also,
At a predetermined position on the back surface 66 of the back seat, there is formed a convex portion 72 which is formed in the blade body 61 and which is fitted into the concave portion 63 for preventing the protrusion and which is loosely fitted and engaged. The fixing member 73 is the same as that shown in FIG.
Since it has the same configuration as the fixing member 40, the same reference numerals are given and the description thereof is omitted. Angles .theta.a = 20.degree. And .theta.b = 40.degree. With respect to a line C2 perpendicular to the blade contact surface 54. The relationship between the angle θa and the angle θb is set to the relationship of tan θb −tan θa = tan (β + γ) −tan γ.

The fixing member 73 provided in this way is mounted on the bottom surface 60 of the tool groove 53 in a state where the adjusting screw 44 is screwed back upward and the tip is retracted into the screw hole 43, and the fixed front surface 42 thereof is placed. To a wall surface 55. Then, the back seat convex portion 70 of the back seat 65 is inserted into the swallow concave portion 57, and the projection portion 72 of the back seat rear surface 66 and the concave portion 63 for preventing one of the blade 61 from popping out.
Is engaged and abutted, and the blade body flank on the lower side in the drawing is placed in contact with the blade body receiving inclined surface 68. Then, the other rake surface 62 of the blade body 61 is brought into contact with the blade body contact surface 54, and the back surface slide contact inclined surface 71 of the back seat convex portion 70 is brought into contact with the engagement inclined surface 59 of the engagement convex portion 58. Contact. In this state, the fixing member 73
When the adjusting screw 44 is screwed, the fixing member 73 is moved upward, and the fixed rear surface 41 is brought into contact with the back seat front surface 67,
The blade 61 is brought into sliding contact with the blade contact surface 54. Then, by further advancing the adjusting screw 44, the back seat 65 is slidably moved along the engaging inclined surface 59, the blade body 61 is moved along the blade receiving inclined surface 68, and the blade body is moved. The blade body 61 is slidably moved in the outer peripheral direction along the contact surface 54.
The cutting edge of is located on a predetermined tangent line L. In this embodiment, the first correction means is constituted by the inclined surface 59 facing the inner circumference of the blade groove and the inclined surface 71 formed on the backing, and the inclined surface formed on the front side in the rotational direction of the blade (lower in the figure). Side flank 62a)
The second correction means is composed of the inclined surface 68 formed on the backing plate and in contact with it.

As described above, since the milling cutter 51 of the present embodiment is constructed, if the rake face is ground by a total of 2 mm by several times of polishing, the cutting radius is reduced by 0.855 mm in the prior art in which the polishing amount is not corrected. Fixing member 7
By screwing the adjusting screw 44 of No. 3, the back seat 65 is slidably moved along the engaging inclined surface 59, the blade body 61 is moved along the blade receiving inclined surface 68, and the blade body is moved. Abutment surface 5
Since it is slidably moved in the outer peripheral direction along the direction of 4, the edge radius is increased by 0.028 mm and is kept substantially constant even after polishing.

Next, FIGS. 5 and 6 show a third embodiment of the present invention. This milling cutter 75 has a cutting edge diameter of 160 mm and is formed at the center angle of the milling cutter body 76 at 90 degree intervals. The blade groove 77 has a vertical blade contact surface 78 (rear surface in the rotational direction) and a bottom surface 79 formed at a right angle on the lower end side of the blade contact surface 78 as shown in the figure. Further, a back seat 95 is provided on the front side in the rotation direction, which is opposed to the blade contact surface 78.
Is provided with a back seat sliding recessed portion 80 slidably fitted therein, and a disc cam 8 as a fixing member is provided on the back side of the back seat sliding recessed portion 80.
A split circular hole 81 into which the 5 is rotatably fitted is formed. An eaves-shaped convex portion 82 is formed on the outer peripheral side of the sliding concave portion 80, and a blade contact surface 78 is formed on the lower surface side of the eaves-shaped convex portion 82.
Angle C1 (= 22 ° 30)
′) The inclined surface 83 is formed, and an inclined surface 84 is formed in parallel with the inclined surface 83 on the lower side corresponding to the inclined surface 83. The upper and lower inclined surfaces 83 formed in this way,
A split circular hole 81 is formed continuously with 84. The inclined surface 83 is an inclined surface facing the inner circumference of the blade groove 77.

The blade body 86 has a cutting edge X as shown in FIG.
In addition, the side surface also has a cutting edge surface 87, the cutting edge diameter at the cutting edge X is 160 mm, the cutting edge angle α2 = 52 ° 06 ', the cutting edge clearance angle β2 = 17 ° 54', and the rake angle γ2 = 20 °. And a common blade back surface 90 which is abutted against the blade rake face 88, the flank face 89 and the blade contact face 78, respectively, and the blade at the lower cutting edge Y of the cutting face 87. Diameter is 14
0 mm, cutting edge angle α1 = 50 °, cutting edge clearance angle β1 = 17 °,
The rake angle .gamma.1 = 23.degree. Is formed, and the blade rake surfaces 88 of each other are formed with engaging recesses 91 which are fitted and engaged with the back seats 95.

An engaging projection 97 is formed at a predetermined height of the blade connecting surface 96, which is the rear surface of the backing seat 95 in the rotational direction, to engage with the engaging recess 91 of the blade 86. ing. Further, inclined surfaces 98 and 99 are formed above and below the blade coupling surface 96 so as to be slidable along the upper and lower inclined surfaces 83 and 84 of the back seat sliding concave portion 80 of the tool groove 77. 98, 9
A receiving surface 100 of the disc cam 85 is formed between the nine. The blade body 86 provided in this manner has an angle θ1 of the back seat slide recess 80 of the blade groove 77 in a state where the engagement recess 91 and the engagement projection 97 of the back seat 95 are fitted and engaged. It is inserted along the inclined surface 83 and the inclined surface 84. Then, the blade body 86 and the back seat 95 are pressed and fixed by rotating the disc cam 85.

Here, the rake face is 2 mm in total with several polishing operations.
If polished, the blade edge angle α 2 = 50 ° at the blade edge X,
Edge clearance angle β2 = 20 °, rake angle γ2 = 20 °,
If the cutting edge angle α1 at the cutting edge Y is set to 50 °, which is equal to α2, the cutting radius at the cutting edge X increases by 0.028 mm, but the cutting radius at the cutting edge Y increases by 0.144 mm (θ1
= 25 ° 24 '). Here, by changing the cutting edge angles α1, α2 and the cutting edge clearance angles β1, β2 of the cutting edge X and the cutting edge Y and setting them as described above, the displacement of the cutting radius is 0.028 at the cutting edge X.
mm and the cutting edge Y can be reduced to 0.034 mm.

That is, tan θ1 = tan (β1 + γ
1) -tan γ1 = tan (β2 + γ2) -tan γ2
If the rake angle γ is not 0 ° (generally, the rake angle is not 0 °) γ1 ≠ γ2 because the cutting radii are different between X and Y. To satisfy, β1 ≠ β2 must be satisfied.
And since α1 + β1 + γ1 = α2 + β2 + γ2 (= 90 ° according to the definition of angle), α1 is also α
Must not be equal to 2. That is, if α1 and α2 or β1 and β2 are different so as to satisfy the above relation,
In both X and Y having different cutting radii, the variation of the cutting radii due to polishing can be both suppressed small. Also in this case, as shown in FIG. 3, in addition to the movement locus of the blade edge being on the tangent line L, it is also possible to select θ1 such that it is at or near L ″. The blade cam and the back seat are fixed by the disc cam, and the width of the blade that cannot be fixed with the fixing screw is small, and the milling machine has a small wall thickness. It is advantageous to apply to cutters.

Next, FIG. 7 shows a fourth embodiment of the present invention. This milling cutter 101 comprises a milling cutter main body 102 and a tool groove formed at a central angle of 90 degrees between the milling cutter main body 102.
The blade 115, the back seat 120, and the fixing member 125 housed in 103
It is composed of This milling cutter 101 has a cutting edge diameter of 1
The blade groove 103 formed on the milling body 102 has a vertical blade contact surface (rear surface in the rotational direction) 104, a bottom surface 105, a blade contact surface 104, and a predetermined surface as shown in the drawing. It is formed by a wall surface 106, which is a front surface in the rotational direction and is opposed to each other at an interval, and an eave-shaped convex portion 107 is formed on the outer peripheral side of the wall surface 106 so as to protrude toward the inside of the blade groove 103.
On the lower surface of the eaves-shaped convex portion 107, there is formed a backsliding contact inclined surface 108 having a predetermined angle θ (= 25 ° 24 ') with respect to a line C4 perpendicular to the blade contact surface 104. Further, at a predetermined position near the wall surface 106 of the bottom surface 105, a fitting recess of the spring member 132 is formed.
109 is recessed. Further, at a predetermined position of the eaves-shaped convex portion 107, a screw hole 110 penetrating inwardly of the groove 103 is screwed and a screw 111 is screwed.

Further, the blade body 115 is formed in a trapezoidal shape in cross section and has upper and lower blade edges which can be used for cutting twice. The blade body 115 comes into contact with the blade body of the blade groove 103. A vertical blade back surface 116 abutting against the surface 104 and a rake surface 117 are formed on the opposite side of the blade back surface 116, and a rake face 117 has a central portion for engaging and coupling with the backing plate 120. A mating recess 118 is provided. The shape of the upper and lower edges of this blade 115 is
For example, the cutting edge angle α (= 50 °) and the cutting edge clearance angle β (= 20
°) and the rake angle γ (= 20 °).

Further, at the predetermined height position of the blade body coupling surface 121, which is the rear surface in the rotation direction of the back seat 120, the engaging concave portion of the blade body 115 is provided.
Engagement protrusions 122 are formed that engage with the engagement with 118. In addition, an inclined surface 123 is formed on the upper part of the blade coupling surface 121 so as to be slidable in accordance with the angle of the back seat sliding contact inclined surface 108 of the eave-shaped convex portion 107 of the blade groove 103, and the front surface in the rotation direction. On the side, a back seat front surface 124 is formed which is slidably in contact with the fixing member 125 and is inclined forward at a predetermined angle.

Further, the fixing member 125 is a fixed rear surface 126 which is slidably contacted with the back surface front surface 124 of the back seat 120 so as to be slidably contactable, and a fixed front surface which is slidably contacted with the wall surface 106 of the tool groove 103.
The upper surface 128 and the lower surface 129, which are substantially parallel to the back surface slide contact inclined surface 108 of the eaves-shaped convex portion 107, are formed in a wedge shape having a substantially modified rectangular cross section in the drawing.
A receiving recess 130 of the spring member 132 is provided on the lower surface 129 so as to face the fitting recess 109 of the bottom surface 105.
Is recessed.

The fixing member 125 provided in this manner is urged and supported in the outer peripheral direction by the spring member 132 having a predetermined spring pressure between the bottom surface 105 of the blade groove 103 and the eaves-shaped convex portion 107 to support the wall surface. 106 is slidably brought into contact with the receiving recess 13
At 0, the tip of the screw 111 is exposed. Also, the blade 115
Is engaged and connected to the engaging concave portion 118 of the rake surface 117 and the engaging convex portion 122 of the blade body coupling surface 121 of the back seat 120, and the back seat 120 is connected to the front face 124 of the back seat of the fixing member 125. The fixed rear surface 126 slidably abuts and the upper inclined surface 12
Reference numeral 3 is in slidable contact with the back seat slidable contact slanted surface 108 of the eave-shaped convex portion 107. Here, the fixing member 125 is replaced by the spring member 132.
By being biased in the outer peripheral direction by the back seat 120, the back seat 120 is moved along the back seat sliding contact inclined surface 108, and the blade body 115 is moved to the outer peripheral side along the blade body contact surface to move the blade body 115. The cutting edge of is located on a predetermined tangent line L.

In this case, the tip of the screw 111 is not in contact with the fixing member 125 but is urged by the spring member 132, and the centrifugal force of the fixing member 125 causes the fixing member 125 to move to the wall surface during cutting rotation. A wedge-shaped bite between 106 and the backing plate 120 acts to firmly fix the blade body 115,
When installing / removing 115, screw 111 in to advance spring 13
The fixing member 125 is pushed down against 2 to mount and remove.

As described above, since the milling cutter 101 of this embodiment is constructed, the cutting radius is reduced by 0.855 mm in the prior art in which the polishing amount is not corrected when the rake face is polished by a total of 2 mm by polishing several times. With this configuration, the backing seat 120 is provided with the canopy-shaped convex portion 107,
The blade body 115 slides along the blade contact surface 104, and the blade 115 slides along the blade contact surface 104 in the outer peripheral direction. Held in. In addition, the backseat 120 is slidably moved along the eaves-shaped convex portion 107 which extends rearward in the rotation direction on the outer peripheral side of the wall surface (front surface in the rotation direction) of the blade groove 103 and has the slanted contact surface 108 for the backseat. Since it is provided in the tool groove 103, it is possible to prevent cutting chips from entering the blade groove 103.

In each of the above embodiments, the angles θ, θ1, θa, and θb are set so that the cutting edge is mainly located on the tangent line of the cutting diameter at the initial cutting edge position, but this angle can be appropriately changed.

[Brief description of drawings]

FIG. 1 is a partial side view of a milling tool according to a first embodiment of the present invention in which a blade body is assembled in a blade groove.

FIG. 2 is a conceptual diagram of a cutting edge displacement amount with respect to a cutting diameter when a rake face of a blade body is polished.

FIG. 3 is an explanatory diagram of correction of a blade edge displacement amount.

FIG. 4 is a partial side view of the milling tool according to the second embodiment of the present invention in which a blade body is assembled in a blade groove.

FIG. 5 is a partial side view showing a cutter body of a milling cutter according to a third embodiment of the present invention in which a cutter body is assembled.

6 is a front view of the blade of FIG.

FIG. 7 is a partial side view in which a blade body is assembled in a blade groove of a milling cutter according to a fourth embodiment of the present invention.

FIG. 8 is a partial side view of a conventional finger cutter.

FIG. 9 (a) is a partial side view of another conventional milling machine. (b) It is sectional drawing of FIG. 9 (a).

[Explanation of symbols]

 11,51,75,101 Planting blade type milling machine 12,52,76,102 Milling machine body 13,53,77,103 Blade groove 25,61,86,115 Blade body 27,62,88,117 Rake face 30,65 , 95, 120 Back seat 18, 59 Engaging inclined surface 35, 71, 108 Back seat sliding contact inclined surface 68 Blade body receiving inclined surface 83, 98, 123 Inclined surface 40, 73, 125 Fixing member 85 Disc cam θ, θ1, θa, θb Inclined surface angle β Edge clearance angle γ Rake angle q, u Displacement amount

Claims (4)

[Claims] 1. A back seat that is provided with a plurality of blade grooves on an outer peripheral portion of a milling cutter body and is housed in the blade grooves, a blade body that is pressed and fixed by the back seat in the rotational direction of the blade groove, and a back seat. And a means for fixing the cutting body to the milling cutter body, the means for compensating for a change in the cutting radius when the rake face of the blade body is polished is an inclined surface facing the inner circumference of the blade groove and the inclined surface. A planting blade type milling machine characterized in that it is composed of an inclined surface formed on a backing seat that comes into contact with the blade. 2. A milling tool body is provided with a plurality of tool grooves on an outer peripheral portion thereof, the back seat being housed in the tool grooves, the back body being pressed and fixed to the rear of the tool groove in the rotational direction by the back seat, and the back seat. And a means for fixing the cutting body to the milling cutter body, the means for compensating for a change in the cutting radius when the rake face of the blade body is polished is an inclined surface facing the inner circumference of the blade groove and the inclined surface. A slanted surface formed on the back seat that abuts against the first
A planting blade characterized by comprising both a correction means and a second correction means composed of an inclined surface formed on the front side in the rotational direction of the blade and an inclined surface formed on a backing seat that abuts on the inclined surface. Expression milling machine. 3. The planting blade type milling machine according to claim 1, wherein the means for fixing the back seat to the milling cutter main body is a cam. 4. The difference in the correction amount of the change in the cutting radius caused by the difference in the radial position of the blade body is further corrected by changing the outer diameter clearance angle and the cutting edge angle of the blade body depending on the radial position. The planting blade type milling machine according to any one of claims 1 to 3, wherein