JPH0785864B2 - Peripheral grinding method for throw-away tip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a main cutting edge and a sub cutting edge of a throw-away tip in a numerically controlled outer peripheral grinder that grinds a throw-away tip on the basis of an inscribed circle. The present invention relates to a peripheral grinding method for grinding and

[Conventional technology]

Generally, in this type of numerically controlled peripheral grinding machine, the upper and lower surfaces of the throw-away tip to be ground are sandwiched, that is, with reference to the center of the inscribed circle of the throw-away tip, the outer circumference (main cutting edge and sub-cutting edge). ) Is being ground.

By the way, in the case of attaching to a cutter such as a milling cutter of a throw-away tip whose outer periphery is ground in this way, as shown in FIG. Therefore, even if the diameters a, a'of the inscribed circles of the throw-away inserts 1, 1'after grinding are within the dimensional tolerance, the inserts of the throw-away inserts 1, 1'assembled in the cutter The difference d between the cutting edge position dimensions b and b ′ is, for example, θ ₁ = θ ₂ = 45
When ゜, And will vary greatly.

[Problems to be solved by the invention]

Therefore, conventionally, after the outer peripheral grinding machine has performed the outer peripheral grinding, the side cutting machine grinds the sub cutting edges 2 and 2'again, and in FIG. However, when performing post-processing in this way, two types of grinding machines must be used, and the setup work requires manpower and time, so processing of one throw-away tip is required. There is a problem that the production time is long and the production cost is high. In addition, when using two types of grinders, clamping is performed twice, so not only the machining reference surface is different, but also variations during clamping are added, and product precision (dimensions and sub cutting edge angles) easily varies. There was a problem.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to perform high-accuracy peripheral cutting of a throw-away tip with one clamp using only a numerically controlled peripheral grinding machine, and a machining time. Can be significantly shortened,
An object of the present invention is to provide a method for grinding the outer periphery of a throw-away tip, which can be automated and unmanned and can significantly reduce the production cost.

[Means for solving problems]

In order to achieve the above object, the present invention, by a numerically controlled grinding machine, to sandwich the upper and lower surfaces of the throw-away tip,
In a peripheral grinding method for grinding a throwaway tip for a cutter having a main cutting edge and a sub-cutting edge and / or a general throwaway tip with a side cut as a center reference, first, the main cutting edge and / or the outer periphery of the throwaway tip are cut. After grinding all, after measuring the diameter of the inscribed circle of this throw away tip, based on the difference between the measured value and the set value of the diameter of this inscribed tip, the secondary cutting based on the center of the throw away tip The grinding locus of the blade and / or the side cut part is calculated as the center reference locus, the movement distance is calculated when this center reference locus is set as the side reference, and the inscribed circle is measured with respect to the center reference locus. The difference between the value and the set value,
It is characterized in that the auxiliary cutting edge and / or the side cut portion is ground by correcting the moving distance.

[Work]

In the method for grinding the outer periphery of the throw-away tip of the present invention, after the main cutting edge of the throw-away tip is ground, the inscribed circle of the throw-away tip is measured, and the difference between the measured value and the set value is corrected in advance. By substituting into the formula, calculate the correction value, and based on this correction value, correct the distance from the center of the throw-away tip to the sub cutting edge and grind the sub cutting edge to determine the side reference sub cutting edge. It can be obtained by center-based grinding.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

1 to 3 show an example of a numerically controlled outer peripheral grinding machine for carrying out the method of the present invention, and FIG. 1 is a schematic configuration diagram,
FIG. 2 is an explanatory diagram showing the relationship between the grindstone and the work clamp device, and FIG. 3 is an explanatory diagram showing an example of the measuring device. In these figures, this numerically controlled peripheral grinder is
It is composed of 10, a measuring device 20, and a control panel 30.

The machine body 10 has a work (throwaway tip).
Work clamp device 12 for holding both upper and lower surfaces W ₁ of W from left and right by a clamp body 11, and this work clamp device 12
The supply device 13 for supplying the work W between the pair of left and right clamp bodies 11, the grindstone base 15 with the grinding grindstone 14 facing the work clamp device 12 mounted on the grindstone shaft, and the work W after the grinding is completed. A conveyor 16 for carrying out and a collecting disk 17 for containing the work W carried out by the conveyor 16 are provided.

The supply device 13 is arranged so that the work W can be held between the clamp bodies 11 of the work clamp device 12.
To supply. Also, the work clamp device 12
Around the axis of the clamp body 11
The workpiece W held by the clamp body 11 is rotated with the center of the workpiece as a reference by rotating the clamp body 11, and as shown in FIG.
The center of 11 and the upper surface of the work are used as a reference for horizontal rotation. Further, the above grinding wheel 14
Is rotated about the grindstone shaft, and as shown in FIG. 2, the grindstone base 15 moves the grindstone shaft on the XY slide mechanism so that the grindstone shaft can move in the front-rear and left-right directions in a horizontal plane. It is configured to be installed.

Further, in the measuring device 20, as shown in FIG. 3, the measuring probe 21 is vertically movable above the work W held by the clamp body 11 of the work clamping device 12, and The value at the time when the probe 23 contacts the side surface of the work W is displayed on the digital indicator 22 and at the same time, input to the control panel 30. The measured value at this time is a comparison difference when the master chip is reset to zero. Further, the control board 30 is configured to control the machine body 10 on the basis of a program stored in advance to perform the outer peripheral grinding of the work W.

Next, with reference to the flow chart shown in FIG. 4, a description will be given of a case where the outer peripheral grinding method for the throw-away tip W of the present invention is carried out by using the numerically controlled outer peripheral grinder configured as described above.

First, as shown in step SP1 of FIG. 4, main cutting edge machining is performed. That is, the supply device 13 supplies the throw-away tip W between the pair of left and right clamp bodies 11 of the work clamp device 12 so that the work W is clamped by both the clamp bodies.
Hold in between 11. Next, as shown in FIG. 5, with one side surface W ₂ of the work W facing the grinding wheel 14, the grinding wheel 14 was fast forwarded (a) to approach one side surface W ₂ of the work W. After that, cutting feed (b) is performed. That is,
In FIG. 5, the grinding wheel 14 is reciprocally moved in the back and forth while being fed leftward toward the paper surface (in FIG. 2, it is reciprocally moved in the left-right direction while being fed downward),
This completes the grinding of one side surface W ₂ of the work W (grinding of the main cutting edge). Subsequently, as shown in FIG. 5, the grinding wheel 14 is retracted from the work W by quick return (c).

Then, both clamp bodies 11 are rotated by 90 ° about their axes so that the next side surface W ₃ of the work W is opposed to the grinding wheel 14, and the same operation as described above is repeated to obtain the side surface of the work W.
Grind W ₃ . When the grinding of all four side surfaces of the work W is completed in this way, one side surface W ₂ of the work W is directed upward, as shown in FIG.
By lowering 21 and bringing the probe 23 into contact with the side surface W _{2 of the} work W, comparative measurement with the master chip is performed and the comparison difference is sent to the control panel 30 (see step SP2 in FIG. 4).

Then, as shown in step SP3 of FIG.
In, the measured value from the measuring device 20 is compared with the preset value of the inscribed circle radius of the work W. Then, the processing of steps SP1 to SP3 is continued until the measured value falls within the set tolerance, and when the measured value falls within the set tolerance, the process proceeds to step SP4, based on the difference between the measured value and the set value. Correct the distance from the center of the inscribed circle of the work W to the sub cutting edge.

The calculation of this correction amount will be described with reference to FIG. 8. First, in this figure, the locus of the cutting edge to be originally processed is A ₀ B ₀ C ₀ , and the inscribed circle of the work W is reduced by x. The locus when the correction is not performed when machining is A ₁ B ₂ C ₂ . If the locus without this correction is set to the side n, the locus is
It becomes A ₃ B ₃ C ₃ . Therefore, in order to match the locus with the side reference and B ₀ C ₀ , the work W may be processed with the center reference after the correction of HI + B ₂ F. That is, the locus to be processed may be A ₁ B ₁ C ₁ .

_{Here, HI = x B 2 F =} B 2 B 3 cos (A-B) , because the angle (FB ₂ B ₃₎ = 90 ° - angle _{(B 3 B 2 A 1)} -B angle (B ₃ B ₂ A ₁ ) = 90 ° -A Therefore, angle (FB ₂ B ₃ ) = 90 °-(90 ° -A) -B = A-B Also, B ₂ B ₃ = A ₁ A ₃ = A ₁ A ₃ ′ = X / sinA Therefore, if the correction amount = HI + B ₂ F = x + xxcos (AB) / sinA = x + {1 + cos (AB) / sinA) A = 45 °, B = 25 ° 30 ', Quantity = 2.333 x x. If the above formula of the correction amount is stored and stored in the control panel 30 in advance and the angles A and B are set as data, based on the difference x between the measured value of the inscribed circle radius of the work W and the set value. The correction amount is calculated immediately. Then, the distance from the center of the work W to the sub cutting edge is corrected based on this correction amount, and the sub cutting edge of the work W is ground based on this corrected value (see step SP5 in FIG. 4). .

That is, as shown in FIG. 7, the work clamp device 12
After rotating the work W held by the specified angle by a predetermined angle, the grinding wheel 14 is moved by fast feed (a) and then cut feed (b) to grind one auxiliary cutting edge W ₄ . Then, the grinding wheel 14 is retracted from the work W by quick return (c), and further, while the work W is rotated by 90 °, the remaining sub cutting edges are ground by the same operation as described above.

When the outer periphery of the work W is ground in this manner, the radius of the inscribed circle of the work W and the distance from the center of the work W to the sub cutting edge are both within the dimensional tolerance, and the work W center is ground. It is possible to perform highly accurate outer peripheral machining of the work W using only the numerically controlled outer peripheral grinder. In the comparison process of step SP3 shown in FIG. 4, when the difference is less than the set tolerance, the process proceeds to step SP6 to eject the chip W.

[Other Embodiments] Next, other embodiments will be described in which the outer peripheral grinding method of the present invention is applied to the outer peripheral grinding of a throwaway chip having an arcuate auxiliary cutting edge using the numerically controlled outer peripheral grinding machine. .

The flow chart in this embodiment is the same as that in FIG. 4, and therefore the flow chart will be described with reference to FIG.

First, similarly to the above-described embodiment, the work W is clamped to the clamp body.
It is sandwiched between 11 to process the main cutting edge (step SP1 ~
Step SP3). Next, when the set value of the circle circumscribed circle radius of the work W falls within the tolerance, the process proceeds to step SP4, and based on the difference between the measured value and the set value, from the center of the inscribed circle of the work W to the sub cutting edge. Correct the distance of.

The calculation of this correction amount will be described based on FIG. 10. First, in this figure, the locus of the cutting edge to be originally processed is J, and the inscribed circle of the work W is radiused from the original radius D / 2. Let K be the locus when it is processed by a large amount by ΔV. If the locus K when this correction is not performed is based on the side nn,
The locus becomes L. Therefore, in order to match the position of the auxiliary cutting edge with the locus J on the basis of the side n−n, the amount of correction indicated by V in the drawing may be converted into the distance from the center of the work W for processing. Here, the correction amount V is given by the following equation from FIG.

V = ΔV + (ΔV · cos θ ₁ / sin θ) In the above equation, θ ₁ is an angle formed by the diagonal line of the work W and the line 1 connecting the center of the arc forming the auxiliary cutting edge and the center of the auxiliary cutting edge.

The correction amount formula is stored and stored in the control panel 30 in advance, the angles θ and θ ₁ are set as data, and based on the difference ΔV between the measured value of the inscribed circle radius of the work W and the set value. The auxiliary cutting edge of the workpiece W (step SP
Five).

Here, in order to grind the auxiliary cutting edge, as shown in FIG. 11, the grinding wheel 14 is first brought close to a predetermined position on the side surface W ₂ of the work W by fast-forwarding. Then, according to the number of divisions in the direction shown by the arrow in FIG. 11, while rotating the clamp body 11 at any fixed angle or while changing the angle as necessary, the grinding wheel 14 is parallel to this. Is gradually retracted from the work W such that the distance from the center of the work W corresponds to the above-mentioned correction amount, and the auxiliary cutting edge is ground. With respect to θ ₁ = 0, that is, the above grinding mechanism also relates to the logarithmic dimension correction of a throwaway chip having a round corner,
It is applicable within the range where the value of R of the round corner is not changed.

As described above, also in the grinding of the throwaway chip of this kind, it is possible to obtain the same effects as those in the first embodiment described above.

When the throw-away tip to be ground is a negative type, the work clamp device 12 does not need to rotate in the horizontal plane, but in the case of the positive type, a turning operation is performed to tilt the work W by a predetermined angle. There is a need. In that case, the rake face of the positive tip is the reference for both the machining reference and the measurement point, and therefore the sub-cutting edge correction numerical control described above is not affected by variations in the machining thickness of the tip. It is also possible to work on the basis of the bottom surface.

〔The invention's effect〕

As described above, the present invention grinds all the main cutting edges and / or the outer periphery of the throw-away tip, then measures the diameter of the inscribed circle of the throw-away tip, and determines the diameter of the inscribed garden. Based on the difference between the measured value and the set value, the grinding locus of the auxiliary cutting edge and / or the side cut part with the center of the throw-away tip as the reference is calculated as the center reference locus, and this center reference locus is set as the side reference. By calculating the moving distance in the case, and correcting the difference between the measured value and the set value of the inscribed circle and the moving distance with respect to the center reference locus, the cutting of the auxiliary cutting edge and / or the side cutting portion can be performed. Since it is performed, the grinding accuracy of the auxiliary cutting edge and / or the cut portion can be processed with high accuracy without being affected by the grinding accuracy of the main cutting edge and / or the outer periphery of the throw-away tip. Moreover, it is possible to perform highly accurate outer peripheral machining using only the numerically controlled outer peripheral grinder, and it is possible to significantly reduce the machining time, automate and unmanned, and significantly reduce the production cost. It has an excellent effect of being able to.

[Brief description of drawings]

1 to 8 show an embodiment of the present invention.
FIG. 1 is a schematic configuration diagram, FIG. 2 is a plan view of a work clamp device and a grinding wheel, FIG. 3 is an explanatory view of a measuring device, FIG. 4 is a flow chart illustrating a processing method, and FIG. FIG. 6 is an explanatory view for explaining the grinding process of the (main cutting edge), FIG. 6 is an explanatory view for explaining the rotation of the work, FIG. 7 is an explanatory view for explaining the grinding process of the auxiliary cutting edge of the work, and FIG. FIG. 9 is an explanatory view for explaining the principle of cutting edge position correction, FIG. 9 is an explanatory view for explaining a conventional grinding method, and FIGS. 10 and 11 show another embodiment of the present invention. FIG. 11 is an explanatory diagram for explaining the principle of sub cutting edge position correction, and FIG. 11 is an explanatory diagram for explaining grinding of the sub cutting edge of the workpiece. 10 …… Machine body, 12 …… Work clamp device, 14 …… Grinding wheel, 20 …… Measuring device, 30 …… Control panel, W …… Work (throw away tip).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Nagasawa 1528 Nakanishita, Yokoi, Kobe, Anpachi-gun, Gifu Prefecture Mitsubishi Metals Co., Ltd. Gifu Works (72) Jiro Waida 1 Showa-cho, Takayama City, Gifu Prefecture Chome 100, In Waida Manufacturing Co., Ltd. (56) Reference JP-A-57-15661 (JP, A)

Claims (1)

[Claims] 1. A numerically controlled grinding machine sandwiches both upper and lower surfaces of a throw-away tip, and a throw-away tip for a cutter having a main cutting edge and a sub-cutting edge, and / or a general throw-away tip with a side cut as a central reference. In the outer peripheral grinding method of grinding, first, the main cutting edge and / or the outer periphery of the throw-away tip are all ground, and then the diameter of the inscribed circle of the throw-away tip is measured, and the diameter of this inscribed circle is measured. When the grinding locus of the secondary cutting edge and / or the side cutting part with the center of the throw-away tip as the reference is calculated as the center reference locus based on the difference between the set value and the set value, and this center reference locus is set as the side reference. By calculating the moving distance, and correcting the difference between the measured value and the set value of the inscribed circle and the moving distance with respect to the center reference locus, Periphery grinding method of the cutting insert, characterized in that to perform the grinding of the blade and or side-cut portion.