JP3291870B2 - Tip positioning method and positioning device for cutting edge-based milling cutter - Google Patents

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 plane-cutting a metal material, and more particularly to an improvement in a method and an apparatus for positioning a chip attached to the milling cutter.

[0002]

2. Description of the Related Art Conventionally, a milling cutter has been used for plane-cutting a metal material. As shown in FIG. 3, the main body 2 of the milling cutter 1 is provided with a plurality of chip mounting grooves 4 for mounting the chips 3 at intervals in the circumferential direction. The stored chip 3 is press-fitted to the cutter main body 2 by a wedge 7 screwed to the cutter main body 2 and fixed detachably. When the tip 3 has worn out and its life has expired, the wedge 7 is removed to remove the old tip 3 and replace it with a new tip 3 so that the cutting ability of the milling cutter 1 can be regenerated. I have.

[0003] By the way, since the milling cutter cuts a metal material in a plane, the cutter body 2 is cut as described above.
It is necessary that the plurality of chips 3 attached to each other be mounted so that their cutting edges are accurately positioned with respect to the cutting edge reference position, and their cutting edges are in contact with the same plane. The insert mounted so as to protrude toward the workpiece with respect to the cutting edge reference position concentrates the cutting load, shortens the service life, shortens the usable time of the milling cutter, and reduces the cutting time. This leads to a decrease in quality. Conversely, a tip mounted in a direction away from the workpiece with respect to the cutting edge reference position reduces the cutting load to be borne, thereby reducing the cutting ability of the milling cutter.

Therefore, conventionally, a tip positioning device 10 as shown in FIG. 4 has been used in order to accurately position the tip 3 with respect to the reference position of the cutting edge and fix it to the cutter body 2. This tip positioning device 10 supports the cutter body 2 rotatably around its axis,
An indexing machine 11 for accurately determining the position of the chip mounting groove in the cutter body 2 in the circumferential direction, a reference stopper 12 having a reference surface 12a for positioning the chip 3 by contacting the cutting edge of the chip 3, and an old chip from the mounting groove 4. A chip exchange robot 13 for removing and installing a new chip, an outer circumferential holding cylinder 14 for urging the chip 3 toward the bottom surface of the mounting groove 4 to temporarily fix the chip 3, and a cutting edge for urging the temporarily fixed chip 3 to urge the cutting edge. To the reference stopper 1
2, a pressing cylinder 1 to be brought into contact with the reference surface 12a.
5, a shift amount measuring device 16 for measuring a shift amount of the cutting edge of the attached tip 3 with respect to the cutting edge reference position;
An automatic driver (not shown) for screwing a wedge fixing the cutter to the cutter body is provided to automatically perform a series of operations for chip replacement.

As shown in FIG. 5, in the chip positioning device 10, the reference stopper 12 is fixed such that its reference surface 12a coincides with the reference position of the cutting edge for positioning the chip 3. Then, each of the plurality of chips 3 which are rotated in the circumferential direction by the splitter 11 and sequentially opposed to the reference stopper 12 is urged by the pressing cylinder 15 so that the cutting edge thereof contacts the reference surface 12a. By being brought into contact, the tips of the plurality of chips 3 are positioned so as to be aligned with the cutting edge reference position.
The milling cutter of the type in which the tip is positioned with respect to the cutter body in this manner is hereinafter referred to as an edge-based milling cutter.

[0006]

However, when the position of the cutting edge of the tip 3 positioned and mounted as described above is measured by the displacement measuring device 16, a plurality of tips are obtained as schematically shown in FIG. There is a chip whose cutting edge is shifted with respect to the cutting edge reference position. That is, FIG.
In the middle, the first, third and third tips 3a, 3c and 3e have their cutting edges coincident with the cutting edge reference position, but the second tip 3b is displaced in the direction away from the cutter body 2 by △ 2 from the reference position. The fourth tip 3d is attached so as to approach the cutter body 2 by # 4 from the reference position of the cutting edge. This is because the shape of each of the plurality of chip mounting grooves 4 provided in the cutter body 2 varies, so that when the wedge 7 is screwed in to fix the chip, the chip 3 deviates from the cutting edge reference position. It is thought to be. It has been confirmed that the amount of displacement of the chip 3 shows a unique value for each mounting groove 4 in which the chip 3 is mounted.

[0007] After the tip 3 attached with a deviation from the cutting edge reference position is detached from the cutter body 2, it is reinstalled so as to be within an allowable limit with respect to the cutting edge reference position. ,
As shown in FIG. 5, since the reference surface 12a of the reference stopper 12 is fixed so as to coincide with the cutting edge reference position, even after the chip is reattached using the reference stopper 12, the chip 3 can be moved from the cutting edge reference position. May be detached and attached. Therefore, in the conventional chip mounting operation, the chip mounting operation has to be repeated many times until it falls within an allowable range with respect to the cutting edge reference position, and there is a problem that the efficiency of the chip mounting operation is extremely low.

[0008] The present invention was made in view of the above problems, the attachment offset from the cutting edge reference position
Object to provide a precisely it is possible to reposition <br/>, chip mounting method and mounting apparatus of the milling cutter can be carried out efficiently mounting operation of the chip is chip against the cutting edge reference position And

[0009]

An object of the present invention is to provide a method of positioning a cutting edge of a chip in accordance with a cutting edge reference position of a milling cutter, comprising: a positioning member having a reference surface with which the cutting edge contacts. After relative positioning with respect to the milling cutter so that the reference plane coincides with the cutting edge reference position, and after positioning the tip with respect to the milling cutter by contacting the cutting edge with the reference plane, The amount of deviation between the blade tip of the positioned tip and the reference position of the blade edge is measured, and the amount of correction of the relative position of the positioning member with respect to the milling cutter at the time of repositioning is calculated based on the amount of deviation. Correcting the relative position of the positioning member to the milling cutter based on the corrected amount, and correcting the relative position. Fit a method of chip positioning edge reference type milling cutter, characterized in that re-positioning the tip again by abutting the edge on the reference surface of the fit member, the cutting edge of the chip to the edge reference position of the milling cutter An apparatus for positioning as described above, a positioning member having a reference surface on which the cutting edge is positioned in contact with, and measuring means for measuring a shift amount between the cutting edge and the cutting edge reference position of the positioned tip, Calculating means for calculating a correction amount of a relative position of the positioning member with respect to the milling cutter at the time of repositioning based on the measured shift amount; and a positioning member with respect to the milling cutter of the positioning member based on the calculated correction amount. And a positioning member position correcting means for correcting the relative position. It is achieved by the chip positioning device.

[0010]

According to the method and the apparatus for positioning a tip of a milling cutter of the present invention, a positioning member used for repositioning a tip mounted at a position shifted from a reference position of the cutting edge. Is corrected based on the position correction amount of the positioning member calculated from the amount of deviation of the tip from the cutting edge reference position, and the chip is repositioned using the corrected positioning member. Thus, the influence of the chip mounting groove on the positioning of the chip can be canceled, so that the chip can be accurately and easily positioned with respect to the cutting edge reference position.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a method for positioning a tip of a milling cutter according to the present invention will be described in detail below with reference to the drawings. Here, FIG. 1 is an explanatory diagram for explaining a chip positioning method of the milling cutter according to the present embodiment, and FIG. 2 is a flowchart for explaining a chip positioning method for the milling cutter of the present embodiment.

First, the work flow of the method for positioning the tip of the milling cutter according to the present embodiment will be described with reference to the flowchart shown in FIG.
The chip positioning work 20 up to 6 is exactly the same as the work flow of the conventional chip mounting method. That is, in step 22, as shown in FIG. 5, the reference surface 12a of the reference stopper 12 as the positioning member is fixed so as to coincide with the cutting edge reference position. And step 23
In the above, each cutting edge of a plurality of chips is brought into contact with the fixed reference surface 12a of the fixed reference stopper 12, thereby positioning and fixing each chip with respect to the cutter body 2. Further, in step 24, the amount of deviation of all the cutting edges from the cutting edge reference position is measured, and based on the measurement result, it is determined in step 25 whether all the chips are within the allowable limit for the reference position.

In the flow 20 of the conventional tip positioning operation, if "No" is determined in step 25, a tip mounted at a position shifted from the reference position of the cutting edge is selected, and the position of the cutting edge of the tip is changed to the cutting edge position. Steps 23 to 25 were repeated until the reference position was within the allowable limit. On the other hand, in the chip positioning operation of the present embodiment, if “No” is determined in step 25, the flow branches to the flow 30 of the chip repositioning operation which is a characteristic part of the present embodiment. Has been. Then, in step 31, based on the data of the displacement amount of all chips obtained in step 24, repositioning of each chip is performed.
In this case, the correction amount of the reference stopper position is calculated. Further, if it is determined in step 32 that the positions of the reference stoppers are to be corrected for all the chips, it is considered that the positioning of the reference stoppers in step 22 was erroneous. Return to. On the other hand, when it is determined that the reference stopper position is corrected for only some of the chips, the process proceeds to the next step 33.

The correction of the stopper position in step 33 will be described in detail with reference to FIG.
Although the positioning is performed using the reference stopper 12 fixed so that the reference surface coincides with the cutting edge reference position in FIG. 2, the cutting edge of the tip 3 is illustrated with respect to the cutting edge reference position as shown in FIG. If the chip 3 is displaced upward, the chip mounting groove 4 in which the chip 3 is mounted
However, this means that the chip 3 tends to be displaced upward in the drawing. Therefore, step 31 in FIG.
In FIG. 1, the calculation result of the stopper position correction amount is output so as to correct the position of the reference stopper to the lower side in the figure with respect to the blade edge reference position as shown in FIG. At this time, in this embodiment, the correction amount of the stopper position is set to be equal to the deviation amount of the tip from the cutting edge reference position. Then, in step 33, the stopper position is corrected according to the calculation result.

[0015] Thus, in step 34, the chip 3 is its cutting edge as shown in FIG. 1 (b) is repositioned so as to be displaced downward in the drawing side of the reference position, the chip 3 is mounted The chip mounting groove 4
Since the tip 3 tends to be displaced upward in the drawing, the cutting edge of the attached tip 3 is displaced and attached so as to coincide with the cutting edge reference position. Then, the amount of displacement of the reattached chip 3 is measured in step 35, and if it is determined “YES” when it is determined in step 36 whether it is within the allowable limit, the process proceeds to step 37. Then, the tip mounting operation is completed. On the other hand, when it is determined to be “No”, the process returns to step 31 again, and the next time based on the measurement data of the displacement amount obtained in step 35,
The amount of correction of the stopper position at the time of re-positioning is calculated, and the operation of steps 32 to 36 is repeated to re-attach the chip.

Next, a chip positioning device for a milling cutter according to the present invention will be described. As shown in FIG. 1, the tip positioning device 40 of the present embodiment measures a deviation amount of a tip position of a tip attached to a milling cutter with respect to a reference position of a tip, and the tip positioning device 40 is measured by the measuring means 41. When repositioning based on the amount of deviation,
And a positioning member position correcting means 43 for correcting the position of the reference stopper 12 based on the calculation result of the calculating means 42. Although it is different from the conventional chip positioning device 10 described above, the other parts are the same.

That is, as shown in FIG. 1A, the measuring means 41 measures the amount of deviation between the cutting edge of the tip 3 and the reference position of the cutting edge with a micrometer, and uses the measured amount of deviation as an electric signal. The data is sent to the calculating means 42. The calculating means 42 is provided by the measuring means 4
1 based on the measurement data of the amount of deviation obtained from the reference stopper 1 at the time of repositioning for each chip.
2. A microcomputer for calculating the position correction amount of No. 2, which sends a signal indicating the calculated position correction amount to the positioning member position correction means 43. The positioning member position correcting means 43 operates a stepping motor based on the position correction amount signal sent from the calculating means 42, thereby changing the relative position of the reference stopper 12 with respect to the milling cutter 1. .

In the above-described chip positioning method for the milling cutter according to the present embodiment, when it is determined in step 32 of the flowchart shown in FIG. 2 that the stopper positions of all the chips are to be corrected, the process returns to step 22. However, there is no need to be bound by this, and it is also possible to proceed to step 33 and reattach all the chips. In the above-described method of positioning the tip of the milling cutter according to the present embodiment, the position correction amount of the positioning member (reference stopper) is set equal to the deviation amount of the tip from the cutting edge reference position, but it is not necessary to be limited to this. Instead, for example, the position correction amount of the positioning member (reference stopper) may be calculated based on the average value of the deviation amounts of all the chips.

[0019]

As described above, the method and apparatus for positioning the tip of the milling cutter according to the present invention have the following excellent effects. That is, in the tip positioning method and the positioning device of the cutting edge reference type milling cutter according to the present invention, when re-attaching the tip that is mounted to be shifted with respect to the cutting edge reference position, according to the amount of displacement of the tip with respect to the cutting edge reference position. Since the relative position of the positioning member for positioning the chip with respect to the milling cutter is corrected and the chip is positioned on the milling cutter using the corrected positioning member, it is affected by the inherent tendency of the chip mounting groove in which the chip is mounted. Without this, the insert can be accurately positioned and attached to the cutting edge reference position. Thereby, each of the plurality of chips attached to the milling cutter equally shares the cutting load, so that not only the use time of the milling cutter can be extended, but also the cutting quality can be improved. In addition, when a new chip is mounted on the milling cutter, the effect of the chip mounting groove on the chip positioning can be eliminated, thereby making it possible to accurately and easily position the chip with respect to the reference position of the cutting edge of the milling cutter. As a result, the chip mounting operation can be performed extremely efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an embodiment of a chip positioning device for a milling cutter according to the present invention.

FIG. 2 is a flowchart illustrating a tip positioning method of a milling cutter according to the present invention.

FIG. 3 is a side view showing the left half of the milling cutter in cross section.

FIG. 4 is an explanatory view schematically showing an apparatus used for chip positioning of a conventional milling cutter.

FIG. 5 is an explanatory view for explaining a conventional chip positioning method of a milling cutter.

FIG. 6 is an explanatory diagram for explaining a shift amount of a chip from a reference position.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 milling cutter 2 cutter body 3 chip 4 chip mounting groove 7 wedge 10 conventional chip positioning device 11 indexer 12 positioning member 12a reference surface 13 chip exchange robot 14 outer peripheral holding cylinder 15 pressing cylinder 16 misalignment measuring device 20 conventional chip positioning Work flow of method 30 Work flow of chip positioning method of the present invention 40 Chip positioning device of the present invention 41 Measuring means 42 Calculation means 43 Positioning member position correcting means

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoaki Shibata 1151 Furamagi, Ishishita-cho, Yuki-gun, Ibaraki Pref. Mitsubishi Materials Corporation Tsukuba Works (56) References Hei 5-228725 (JP, A) Actually open Hei 4-128107 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23C 9/00 B23C 5/24

Claims (2)

(57) [Claims] 1. A method of positioning a cutting edge of a tip in accordance with a cutting edge reference position of a milling cutter, wherein a positioning member having a reference surface with which the cutting edge contacts is adjusted so that the reference surface coincides with the cutting edge reference position. After relative positioning with respect to the milling cutter, and after positioning the chip with respect to the milling cutter by contacting the blade edge with the reference surface, the blade edge of the positioned tip and the blade edge reference position, the milling cutter of the displacement amount was measured, calculates the amount of correction of the relative position relative to the milling cutter of the positioning member definitive when repositioning on the basis of the shift amount, the positioning member on the basis of the calculated correction amount And the cutting edge is brought into contact with the reference surface of the positioning member having the corrected relative position. The cutting edge-referencing milling cutter chip positioning method characterized by chip re-positioning <br/> Me again by. 2. An apparatus for positioning a cutting edge of a tip so as to match a cutting edge reference position of a milling cutter, wherein: a positioning member having a reference surface on which the cutting edge contacts and is positioned; Measuring means for measuring the amount of deviation between the cutting edge and the reference position of the cutting edge, and calculating means for calculating the correction amount of the relative position of the positioning member to the milling cutter at the time of repositioning based on the measured amount of deviation. And a positioning member position correcting means for correcting the relative position of the positioning member with respect to the milling cutter based on the calculated correction amount.