JP4609304B2 - Insert peripheral grinding method and peripheral grinding apparatus - Google Patents

Description

  The present invention relates to an outer periphery grinding method and an outer periphery grinding apparatus for an insert formed by grinding a main cutting edge, a sub cutting edge, a round corner, and the like of an insert.

In general, in a numerically controlled grinding machine, the main and secondary cutting edges, round shape are set so that the inscribed circle center of the insert body formed by sandwiching and grinding the insert base material to be ground is the reference. An insert body that is an insert is formed by grinding corners and the like.
The insert body formed in this way is fixed to the holder, and turning can be performed by moving the workpiece relative to the insert body, or the workpiece can be turned by rotating the holder around its axis. To do. Here, when the insert body is mounted on the holder, the insert body is fixed by screwing or the like with the lower surface and side surfaces of the insert body in contact with predetermined positions of the holder.

In such an insert, after grinding the entire outer periphery of the insert base material to form the insert body, the inscribed circle of the insert body is measured, and the difference between this measured value and the design dimension is set to a correction equation set in advance. There has been proposed a peripheral grinding method that corrects the distance from the non-standard periphery of the insert body to the corner or the radius of the round corner by substituting (for example, see Patent Documents 1 and 2). In this way, by grinding the corner or round corner based on the correction amount, numerical control that eliminates the variation of the corner position or the round corner position with respect to the outer periphery and performs grinding with the center reference of the insert body The insert body can be ground with high precision using only a grinding machine.
JP 63-306863 A JP-A-1-183349

  However, the conventional peripheral grinding method for inserts has the following problems. That is, even in the conventional outer periphery grinding method of the insert described above, it is desired to further suppress the variation in the cutting edge position when the holder is fixed. For example, when forming the inscribed circle radius on the upper surface side of the insert body to be the design value, if the thickness of the insert base material is thinner than the design value, the position of the cutting edge portion when mounted on the holder, Compared with the case where the thickness of the insert base material is as designed, it protrudes outward with respect to the axis of the holder. Therefore, for example, when the workpiece is turned by rotating the holder around the axis, the turning position is shifted.

  The present invention has been made in view of the above-described problems, and provides an outer periphery grinding method and an outer periphery grinding device for an insert in which the cutting edge position is stable when mounted on a holder regardless of the thickness of the insert base material. Objective.

The present invention employs the following configuration in order to solve the above problems. That is, the outer peripheral grinding method of the insert according to the present invention is an insert having a main cutting edge and a secondary cutting edge that are crossed ridge lines between the upper surface and the side surface by sandwiching a plate-like insert base material using a numerically controlled grinding machine. In an outer periphery grinding method of an insert formed by grinding a main body with a center reference based on the center of the upper surface, the thickness of the insert base material is measured, and based on a difference between the measured value of the thickness and a design value By correcting the design value of the diameter of the inscribed circle of the insert body, the insert base material is ground based on the center to form one or both of the main cutting edge and the outer periphery, and the insert intermediate After forming the body, the diameter of the inscribed circle of the insert intermediate is measured, the difference between the measured value of the diameter of the inscribed circle and the corrected design value, and the measured value and design of the thickness of the insert base material From the difference in value, It calculates the grinding path of the auxiliary cutting edge to the center of the reference as center reference trajectory, the said central reference trajectory by calculating the moving distance of setting the side reference, with respect to the calculated the center reference locus was From the measured value of the inscribed circle and the corrected design value, the measured value of the thickness of the insert base material, the difference of the design value, and the moving distance, the secondary cutting edge from the center of the insert intermediate correcting the distance between, and performing grinding of sub cutting edge.

Further, the peripheral grinding apparatus for inserts of the present invention comprises a sandwiching means for sandwiching a plate-like insert base material, and an insert body having a main cutting edge and a secondary cutting edge that are intersecting ridge lines between the upper surface and the side surface. A grinding means for grinding with a center reference with respect to the center, a measuring means for measuring a diameter of an inscribed circle of the insert intermediate formed with either or both of the main cutting edge and the outer periphery, and Control means for controlling, the control means corrects the design value of the diameter of the inscribed circle of the insert body from the thickness of the insert base material, and the main cutting by the design value of the corrected inscribed circle A main cutting edge formation control unit for outputting a main cutting edge grinding signal for forming either one or both of a blade and an outer periphery to the grinding means; a measured value of the inscribed circle diameter of the insert intermediate and the correction; Design value difference and the insert base material Grinding trajectory of the auxiliary cutting edge from the difference between the thickness of the measurement value and the design value as a reference the center of the insert intermediate calculated as center reference trajectory, movement of the case where the said center reference trajectory is set to the side reference A distance is calculated, based on the difference between the measured value of the inscribed circle and the corrected design value with respect to the center reference locus, the difference between the measured value and the design value of the thickness of the insert base material, and the moving distance. said insert from said center of the intermediate corrected distance in the auxiliary cutting edge until, the sub-cutting edge grinding signal for grinding the sub cutting edge in corrected position outputs to said grinding means auxiliary cutting edge forming controller Te It is characterized by providing.

According to the present invention, even when the thickness of the insert base material is different from the design value, the variation in the distance between the cutting edge position and the holder shaft can be further suppressed at the time of mounting on the holder, and a stable workpiece can be obtained. An insert that can be processed is obtained. That is, the design value of the inscribed circle diameter of the insert body formed according to the thickness of the insert base material is corrected, and the holder is mounted on the holder based on the corrected design value of the inscribed circle diameter. Grind so that the distance between the cutting edge position and the axis of the holder is constant. Thereby, even if the thickness of the insert base material is different from the design value, the position of the cutting edge is more stable when mounted on the holder.
Here, after correcting the design value of the diameter of the inscribed circle based on the thickness of the insert base material, either or both of the main cutting edge and the outer periphery are formed. The difference with respect to the design value of the length of the side cut portion can be reduced.

Further, the outer peripheral grinding method of the insert of the present invention is an insert having a main cutting edge and a secondary cutting edge that are crossed ridge lines between the upper surface and the side surface by sandwiching a plate-like insert base material using a numerically controlled grinding machine. In an outer periphery grinding method of an insert formed by grinding a main body with a center reference with respect to the center of the upper surface, the insert base material is ground with a center reference and either or both of the main cutting edge and the outer periphery Forming an insert intermediate, measuring the diameter of the inscribed circle of the insert intermediate, the difference between the measured value and the design value of the diameter of the inscribed circle, and the insert base material or the insert intermediate Based on the difference between the measured thickness value and the design value of the body, the grinding trajectory of the secondary cutting edge based on the center of the insert intermediate is calculated as the central reference trajectory, and the central reference trajectory is set as the side reference. When The difference between the measured value and the design value of the inscribed circle and the measured value and the design value of the thickness of the insert base material or the insert intermediate is calculated with respect to the calculated center reference locus. wherein from a moving distance, a length of the at auxiliary cutting edge or corrected from the center of the insert intermediate, and performing grinding sub cutting edge and.

Further, the peripheral grinding apparatus for inserts of the present invention comprises a sandwiching means for sandwiching a plate-like insert base material, and an insert body having a main cutting edge and a secondary cutting edge that are intersecting ridge lines between the upper surface and the side surface. A grinding means for grinding with a center reference with respect to the center, a measuring means for measuring a diameter of an inscribed circle of the insert intermediate formed with either or both of the main cutting edge and the outer periphery, and Control means for controlling, and the control means outputs a main cutting edge grinding signal for forming either or both of the main cutting edge and the outer periphery at a design value to the grinding means. And the difference between the measured value of the inscribed circle of the insert intermediate and the design value and the difference between the measured value and the design value of the thickness of the insert base material or the insert intermediate, center before, relative to the start of the Grinding trajectory of the auxiliary cutting edge is calculated as a center reference trajectory, the said center reference trajectory calculates the moving distance of setting the side standards, measurements and design values of the inscribed circle with respect to the center reference locus the distance of the at auxiliary cutting edge or from a center of said insert intermediate corrected based on the difference between the thickness of the measurement value and the design value of the difference between the insert base material or the insert intermediate and said moving distance, the And a sub cutting edge formation control section for outputting a sub cutting edge grinding signal for grinding the sub cutting edge at the corrected position to the grinding means.

  According to this invention, as described above, even when the thickness of the insert base material is different from the design value, the position of the cutting edge is more stable when mounted on the holder.

Further, the outer peripheral grinding method of the insert of the present invention is a method in which a plate-shaped insert base material is sandwiched using a numerically controlled grinding machine, and an insert body having a round corner which is at least a part of an intersecting ridge line portion between an upper surface and a side surface. In the outer peripheral grinding method of the insert formed by grinding with a center reference based on the center of the upper surface, the thickness of the insert base material is measured, and the thickness is measured based on the difference between the measured value and the design value. The insert intermediate body is corrected by correcting the design value of the diameter of the inscribed circle of the insert body, and grinding the insert base material on the basis of a center to form either or both of the main cutting edge and the outer periphery. After forming, the diameter of the inscribed circle of the insert intermediate is measured, and the difference between the measured value of the inscribed circle and the corrected design value and the measured value and the designed value of the thickness of the insert base material From the difference, Correcting the position of the round corner of the main body on the basis of the outer periphery, correcting the corner radius so that the round corner is formed continuously with the adjacent outer periphery, and grinding the round corner To do.

Further, the peripheral grinding apparatus for inserts of the present invention has a sandwiching means for sandwiching a plate-like insert base material, and an insert main body having a round corner that is at least a part of an intersecting ridge line portion between the top surface and the side surface at the center of the top surface. Grinding means for grinding with a reference center reference, measuring means for measuring the diameter of the inscribed circle of the insert intermediate body in which one or both of the main cutting edge and the outer periphery are formed, and controls these Control means, and the control means corrects the design value of the diameter of the inscribed circle of the insert body from the thickness of the insert base material, and the main cutting edge with the corrected design value of the inscribed circle. A main cutting edge formation control unit that outputs a main cutting edge grinding signal for forming either one or both of the outer periphery and the grinding means, a measured value of an inscribed circle diameter of the insert intermediate body, and the corrected design The difference between the values The position of the round corner of the insert body is corrected with reference to the outer periphery from the difference between the measured value and the design value of the thickness of the base material, and the round corner is formed continuously with the adjacent outer periphery. And a round corner formation control section for correcting a corner radius and outputting a round corner grinding signal for grinding the round corner with the corrected corner radius to the grinding means.

According to the present invention, similarly to the above, even when the thickness of the insert base material is different from the design value, the variation in the distance between the cutting edge position and the holder shaft is further suppressed during mounting on the holder. An insert that can process a stable workpiece can be obtained. That is, the design value of the inscribed circle diameter of the insert body formed according to the thickness of the insert base material is corrected, and the holder is mounted on the holder based on the corrected design value of the inscribed circle diameter. Grind so that the distance between the cutting edge position and the axis of the holder is constant.
Moreover, since the round corner is formed after correcting the design value of the diameter of the inscribed circle based on the thickness of the insert base material, the difference from the design value of the round corner radius can be reduced.

Further, the outer peripheral grinding method of the insert of the present invention is a method in which a plate-shaped insert base material is sandwiched using a numerically controlled grinding machine, and an insert body having a round corner which is at least a part of an intersecting ridge line portion between an upper surface and a side surface. In an outer periphery grinding method of an insert formed by grinding with a center reference with respect to the center of the upper surface, the insert base material is ground with a center reference to form one or both of the main cutting edge and the outer periphery. And measuring the diameter of the inscribed circle of the insert intermediate, the difference between the measured value and the design value of the diameter of the inscribed circle and the insert base material or the insert intermediate The position of the round corner of the insert body is corrected with reference to the outer periphery from the difference between the measured thickness value and the design value of the insert, and the round corner is formed continuously with the adjacent outer periphery. Correcting the urchin corner radii, characterized by grinding the round corners.

Further, the peripheral grinding apparatus for inserts of the present invention has a sandwiching means for sandwiching a plate-like insert base material, and an insert main body having a round corner that is at least a part of an intersecting ridge line portion between the top surface and the side surface at the center of the top surface. Grinding means for grinding with a reference center reference, measuring means for measuring the diameter of the inscribed circle of the insert intermediate body in which one or both of the main cutting edge and the outer periphery are formed, and controls these A main cutting edge formation control unit that outputs a main cutting edge grinding signal for forming either or both of the main cutting edge and the outer periphery at a design value to the grinding means. From the difference between the measured value and the design value of the diameter of the inscribed circle of the insert intermediate body and the difference between the measured value and the design value of the thickness of the insert base material or the insert intermediate body, the round corner of the insert body A round corner grinding signal for correcting the position based on the outer periphery reference, correcting the corner radius so that the round corner is formed continuously with the adjacent outer periphery, and grinding the round corner with the corrected corner radius. And a round corner formation control unit for outputting to the grinding means.

  According to this invention, as described above, even when the thickness of the insert base material is different from the design value, the position of the cutting edge is more stable when mounted on the holder.

  According to the outer peripheral grinding method and outer peripheral grinding device of the present invention, even when the insert base material having a different thickness is ground to form the insert body, the distance between the cutting edge position and the holder shaft when mounted on the holder. Therefore, it is possible to obtain an insert that can more stably process a workpiece.

Hereinafter, a first embodiment of an insert outer peripheral grinding method and an outer peripheral grinding apparatus according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the insert body 1 formed by the outer periphery grinding method of the insert according to the present embodiment is a substantially rectangular plate-like member, and a plurality of intersecting ridge lines between the upper surface 2 a and the side surfaces 3 a to 3 d. At least one of the parts is a main cutting edge.
Moreover, in this embodiment, the insert main body 1 is formed by grinding the outer periphery of this insert base material using the plate-shaped insert base material which is slightly larger on the outer peripheral side than the insert main body 1 which is the target shape. The insert base material has the same thickness as the insert body 1.

  Moreover, the outer periphery grinding method of the insert by this embodiment is performed by the numerical control grinding machine (outer periphery grinding apparatus) 20 as shown in FIG. The numerically controlled grinding machine 20 includes a machine main body 21, a measuring device (measuring means) 22, and a control board (control means) 23.

  The machine body 21 has a work clamping device (clamping means) 24 for clamping a plate-shaped insert base material, a supply device 25 for supplying the insert base material to the work clamping device 24, and an insert clamped by the work clamping device 24. A grindstone stand (grinding means) 26 for grinding the base material, a conveyor 27 for carrying out the insert body 1 which is a ground insert, and a collecting disk 28 for housing the carried out insert body 1 are provided.

The work clamp device 24 includes a pair of clamp members 31 that sandwich both sides of the insert base material in the thickness direction. The workpiece clamping device 24 is capable of rotating the clamping member 31 around the axis of the pair of clamping members 31. Thus, by rotating the clamp member 31, the insert base material clamped by the pair of clamp members 31 is rotated with the center of the insert base material as a reference. Further, the work clamp device 24 is configured such that the pair of clamp members 31 can turn horizontally with reference to the center of the pair of clamp members 31 and the upper surface of the insert base material in principle.
The work clamp device 24 can measure the thickness of the inserted insert base material, and is configured to output the measurement result of the thickness to the control panel 23.

The supply device 25 supplies the insert base material so as to be sandwiched between the pair of clamp members 31 of the work clamp device 24.
Further, the grindstone base 26 includes a grinding grindstone 32 that is disposed so as to face the insert base material sandwiched between the pair of clamp members 31 and is attached to the grindstone shaft. And the grindstone base 26 is mounted on the XY slide mechanism so that the grindstone 32 rotates around the grindstone axis and moves in the front-rear and left-right directions in the horizontal plane as shown in FIG. Has been.

  As shown in FIG. 4, the measuring device 22 includes a measuring probe 33 disposed so as to be movable up and down above an insert base material sandwiched between a pair of clamp members 31, and a measuring element 34 disposed at the tip of the measuring probe 33. Is provided with a digital indicator 35 for displaying a value at the time of contact with the insert base material. The measuring device 22 is configured to output a value at the time when the measuring element 34 comes into contact with the insert base material to the control panel 23.

  The control panel 23 is configured to control the machine main body 21 based on a pre-recorded program to perform the outer peripheral grinding of the insert base material to form the insert main body 1. A main cutting edge formation control unit 36 that outputs a cutting edge grinding signal and a sub cutting edge formation control unit 37 that outputs a sub cutting edge grinding signal are provided. The program recorded on the control panel 23 will be described later.

Next, an insert outer peripheral grinding method using the numerically controlled grinding machine 20 will be described.
First, an insert base material is carried in (step ST11 shown in FIG. 5). Then, the thickness of the insert base material is measured (step ST12 shown in FIG. 5). That is, the insert base material is sandwiched between the pair of clamp members 31 of the work clamp device 24 by the supply device 25. At this time, the thickness of the insert base material is measured and the result is output to the control panel 23.

Next, the main cutting edge formation control unit 36 corrects the design value of the diameter of the inscribed circle of the insert body 1 to be formed from the difference between the measured value of the thickness of the insert base material and the design value (see FIG. 5). Step ST13 shown).
The correction of the design value of the diameter of the inscribed circle will be described. Here, for example, as shown in FIG. 6A, the dimension of the design value is T _{1 for} the thickness, R ₁ for the inscribed circle radius on the upper surface side, and θ for the clearance angle. As shown, when the thickness is T ₂ which is thinner than the design value, the main cutting edge and the auxiliary cutting edge are processed so that the inscribed circle radius and clearance angle on the upper surface side of the insert base material are as designed values. Suppose that is done.
The ground insert body 1 is fixed by screws or the like so that the lower surface 2b and the side surfaces 3b and 3c are in contact with predetermined positions of the holder H, as shown in FIG. Accordingly, when the main cutting edge and the auxiliary cutting edge are machined so that the inscribed circle radius on the upper surface side is R ₁ , the insert body ₁ having the design dimension and the thickness of the insert base material is thinner than the design value. When the lower surface 2a and the side surfaces 3b and 3c are overlapped with each other, one side of the side surface 3a and 3d of the insert body 1 on the side of the upper surface 2a protrudes as shown in FIG. The protrusion amount _{x 1} is
x ₁ = (T ₁ −T ₂ ) tan θ
It becomes. Therefore, when the thickness of the insert body 1 is thinner than the design value, the inscribed circle radius is corrected to be smaller by x ₁ than the design value. Incidentally, when the thickness of the insert body 1 is thicker than the design value, the inscribed circle radius is corrected to be larger by x ₁ than the design value.

Next, the main cutting edge formation control unit 36 outputs a main cutting edge grinding signal to the machine main body 21, and forms the main cutting edge based on the corrected design value (step ST14 shown in FIG. 5). In this case, the insert base material is supplied between the pair of clamp members 31 of the work clamp device 24 by the supply device 25, and the insert base material W is sandwiched between the pair of clamp members 31. Then, as shown in FIG. 8 (a), the grindstone 32 is brought close to one side surface W1 of the insert base material W by rapid feed in a state where one side surface W1 of the insert base material W is opposed to the grinding wheel 32. After that, cutting feed is performed. That is, the grinding wheel 32 is reciprocated in the direction of arrow A2, which is the thickness direction of the insert base material W, while moving in the direction of arrow A1. Thereby, the grinding of one side surface W1 of the insert base material W is completed. Subsequently, the grinding wheel 32 is retracted from the insert base material W by rapid return.
Next, as shown in FIG. 8 (b), the pair of clamp members 31 are rotated by 90 ° around the axis of the clamp member 31, and the next side surface W2 of the insert base material is opposed to the grinding stone 32, and the same as described above. The side W2 is ground by the above operation. In this way, all four side surfaces W1 to W4 of the insert base material W are ground. Thereby, an insert intermediate body is formed.

  Then, the inscribed circle radius of the insert intermediate is measured (step ST15 shown in FIG. 5). This is because, with one side surface W1 of the insert intermediate body W5 facing upward, as shown in FIG. 4, the measuring probe 33 is lowered, and a measuring element is placed on the upper side of the side surface W1 of the insert intermediate body W5. By contacting 34, the inscribed circle radius on the upper surface of the insert intermediate body W5 is measured. Further, the difference between the measured inscribed circle radius and the design value corrected in step ST13 described above is output to the control panel 23.

Subsequently, the control panel 23 determines whether or not the difference between the measured value of the inscribed circle radius and the corrected design value is within a predetermined value.
In step ST16, when the difference between the measured value of the inscribed circle radius and the corrected design value exceeds a predetermined value, the process returns to step ST14, and all the side surfaces 3a to 3d of the insert body 1 are ground.

In step ST16, when the difference between the measured value of the inscribed circle radius and the corrected design value is within a predetermined value, the secondary cutting edge formation control unit 37 determines that the inner diameter of the insert intermediate is based on the difference. The distance from the center of the tangent circle to the auxiliary cutting edge is corrected (step ST17 shown in FIG. 5).
For example, as shown in FIG. 9, the position after the thickness correction of the inscribed circle portion (x ₁ ′ = (T ₁ −T ₂ ) tan θ ₁ (θ ₁ is the clearance angle of the inscribed circle portion)). A ₀ B ₀ , the position after the thickness correction (x ₁ ″ = (T ₁ −T ₂ ) tan θ ₂ (θ ₂ is the clearance angle of the auxiliary cutting edge portion)) of the auxiliary cutting edge portion is set to B _0. When C _0, the trajectory of the cutting edges of the corrected original to be working thickness becomes a ₀ B ₀ C _0. here, the inscribed circle radius of the insert intermediate is processed to be reduced by x ₂ In this case, the locus of the cutting edge when the correction of the measured value of the inscribed circle radius is not performed is A ₁ B ₁ C _{1. When} this locus is set as the reference of the side n, the locus is A ₂ B ₂ C _2. Therefore, in order to make the locus of the cutting edge coincide with B ₀ C ₀ on the basis of the side n,
x ₃ = D ₁ D ₂
Then, it is necessary to grind the insert body 1 with a center reference based on the center of the upper surface 2a . That is, the locus of the cutting edge to be processed is A ₁ B ₃ C ₃ .

Here, as shown in FIG.
D ₁ D ₂ = D ₁ D ₃ + D ₂ D ₃
= D ₁ D ₃ + B ₁ D ₄
It becomes. Also,
D ₁ D ₃ = x ₂
∠B ₂ B ₁ D ₄ = 90 ° −∠B ₂ B ₁ A ₁ -β
∠ B ₂ B ₁ A ₁ = 90 ° -α
So
∠B ₂ B ₁ D ₄ = α-β
It becomes. Also,
B ₁ B ₂ = A ₁ A ₂ = A ₁ A ₃ = x ₂ / sin α
So
B ₁ D ₄ = B ₁ B ₂ cos (α-β)
It becomes. From the above,
D ₁ D ₂ = D ₁ D ₃ + B ₁ D ₄
= X ₂ + x ₂ × cos (α−β) / sin α
= X ₂ (1 + cos (α−β) / sin α)
It becomes. The calculation method of the correction amount is recorded in the control panel 23 in advance, and the angles A and B are set as data, so that the difference x ₂ between the measured value of the inscribed circle radius of the insert body 1 and the set value is obtained. Based on this, the correction amount is immediately calculated. Then, based on this correction amount, the distance from the center of the insert intermediate body to the auxiliary cutting edge is corrected. In other words, calculate the sum of the difference between the design value of the diameter of the inscribed circle corrected from the measured thickness value and the measured value after processing, and the position of the auxiliary cutting edge corrected from the measured thickness value, The position of the auxiliary cutting edge is corrected.

Next, the secondary cutting edge formation control unit 37 outputs a secondary cutting edge grinding signal to the machine body 21, and based on the corrected design value, the insert intermediate is ground to form the secondary cutting edge (see FIG. 5). Step ST18 shown). In the same manner as described above, after the insert intermediate body sandwiched between the pair of clamp members 31 of the work clamp device 24 is rotated at a predetermined angle, the grinding wheel 32 is moved by fast-feed cutting feed and one sub-feed is moved. Grind the cutting edge. Subsequently, the grinding wheel 32 is retracted from the insert intermediate body by rapid return, and further, the remaining auxiliary cutting blade is ground by the same operation as described above while rotating the insert intermediate body by 90 °. In addition, you may give the process which makes the joint surface of a main cutting blade and a subcutting blade into a curved surface at this time.
Thereafter, the ground insert body 1 is carried out by the conveyor 27 and accommodated in the collection disk 28 (step ST19 shown in FIG. 5). When the outer periphery grinding of the insert body 1 is performed in this manner, it is possible to grind the insert with high accuracy using only the numerically controlled grinding machine 20 that performs grinding based on the center reference of the insert body 1.

In step ST16, when the measured value of the inscribed circle radius is smaller than the corrected design value, the insert intermediate is discharged (step ST20 shown in FIG. 5), and the process ends.
The inscribed circle measurement data is recorded in the control panel 23 and reflected when the next insert base material is processed.

  As described above, according to the outer periphery grinding method and the numerically controlled grinding machine 20 of the present embodiment, even when the insert base material having a different thickness is ground to form the insert main body, Variations in the distance from the holder shaft are less likely to occur, and an insert body that can perform stable workpiece processing can be formed. Here, the design value of the inscribed circle radius is corrected based on the thickness of the insert base material, and the insert intermediate is formed so as to have this corrected inscribed circle radius. The deviation from the design value can be reduced.

Next, a second embodiment will be described with reference to the drawings. The embodiment described here has the same basic configuration as that of the first embodiment described above, and is obtained by adding another element to the first embodiment described above. Accordingly, the same components are denoted by the same reference numerals, and description thereof is omitted.
The outer peripheral grinding method and outer peripheral grinding device of the insert according to the second embodiment are an outer peripheral grinding method and an outer peripheral grinding device that form round corners.
That is, in the insert body 40 formed by the outer periphery grinding method of the insert in the present embodiment, as shown in FIG. 10, at least one of the plurality of intersecting ridge lines of the upper surface 41a and the side surfaces 42a to 42d is round. It is a corner 43.
As shown in FIG. 11, the numerically controlled grinding machine 45 includes a main cutting edge formation control unit 36 and a round corner formation control unit 47 that outputs a round corner grinding signal to the machine body 21. ing.

Next, an insert outer peripheral grinding method using the numerically controlled grinding machine 45 will be described.
First, as in the first embodiment described above, after the insert base material is carried in (step ST21 shown in FIG. 12), the thickness of the insert base material is measured (step ST22 shown in FIG. 12), and the insert to be formed The design value of the diameter of the inscribed circle of the main body 40 is corrected (step ST23 shown in FIG. 12).

Next, the outer periphery that becomes the cutting edge of the insert body 40 is processed to form an insert intermediate (step ST24 shown in FIG. 12).
And the inscribed circle radius in the upper surface of an insert intermediate body is measured (step ST25 shown in FIG. 12). Further, the difference between the measured inscribed circle radius and the design value corrected in step ST23 described above is output to the control panel 46.

Subsequently, in the control panel 46, it is determined whether or not the difference between the measured value of the inscribed circle radius and the corrected design value is within a predetermined value (step ST26 shown in FIG. 12).
In step ST26, when the difference between the measured value of the inscribed circle radius and the corrected design value exceeds a predetermined value, the process returns to step ST24, and all side surfaces of the insert intermediate are ground.

In step ST26, when the difference between the measured value of the inscribed circle radius and the corrected design value is within a predetermined value, the distance from the center of the inscribed circle of the insert intermediate to the round corner is determined based on this difference. In addition to the correction, the corner radius is corrected so that the adjacent outer periphery becomes a tangent to the round corner and the outer periphery and the round corner are continuously formed smoothly (step ST27 shown in FIG. 12).
For example, as shown in FIG. 13, the inscribed circle C _{1 of the} processed insert body 40 is processed with the inscribed circle whose thickness is corrected for the reference insert S ₂ as a reference inscribed circle C _{0 and} a reference diameter of φ ₀ . If the diameter of the insert is φ ₁ (where φ ₁ > φ ₀ ), the dimension 2ε between the corners K ₀ and K ₁ of each insert when the outer peripheries l and m are used as a reference is
_{2ε = φ 1 / cosγ-φ} 0 / cosγ
= (Φ ₁ −φ ₀ ) / cos γ
It becomes. Further, as shown in FIG. 14, when the corner radii of the round corners M ₀ and M ₁ of the respective inserts S ₀ and S ₁ are R _a and R _b , respectively, from the corner K ₀ to the round corner M ₀ or M ₁ . The dimension δ is
δ = (R _a / cos γ) −R _a
= R _a (1-cosγ) / cosγ
It becomes. Also,
2ε + δ = (R _b / cos γ) −R _b
= R _b (1-cosγ) / cosγ
So, from these,
R _b −R _a = (φ ₁ −φ ₀ ) / (1-cos γ)
It becomes. Here, since φ ₁ > φ ₀ ,
R _b −R _a > 0
It becomes. Therefore, for the correction of the distance from the center of the inscribed circle C ₁ of the insert body 40 to the round corner M ₁ ,
2ε = (φ ₁ −φ ₀ ) / cos γ
Is used. However, since the above equation is a correction equation when the outer periphery l, m is used as a reference, it is converted into a correction equation when the center of the inscribed circle is used as a reference,
ε = (φ ₁ −φ ₀ ) / 2 cos γ
Is input to the control panel 46. The correction formula for the corner radius _Rb is
R _b = (φ ₁ −φ ₀ ) / (1-cos γ) + R _a
Is input to the control panel 46. Then, if γ that is different depending on the type of the insert body 40 is input to the control panel 46, the correction amount is immediately calculated based on the difference (φ ₁ −φ ₀ ) / 2.

Next, based on the corrected design value, the insert body 40 is ground to form a round corner 43 (step ST28 shown in FIG. 12). In the same manner as described above, after the insert main body 40 sandwiched between the pair of clamp members 31 is rotated by a predetermined angle, the grinding wheel 32 is moved by fast-feed cutting feed, and the round corner 43 is ground.
The ground insert body 40 is then carried out (step ST29 shown in FIG. 12).

In step ST26, when the measured value of the inscribed circle radius is smaller than the corrected design value, the insert body 40 is discharged (step ST30 shown in FIG. 12), and the process ends.
The inscribed circle measurement data is recorded in the control panel 46 and reflected when the next insert base material is processed.

  As described above, also in the outer periphery grinding method of the insert according to the present embodiment, as in the first embodiment described above, variation in the cutting edge position is suppressed when mounted on the holder, and stable workpiece machining can be performed. Inserts can be formed.

In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the above-described embodiment, the inscribed circle radius on the upper surface of the insert main body is set as the design value, but the inscribed circle radius in other locations may be set as the design value. For example, when the inscribed circle radius on the lower surface of the insert body is set as the design value, the design value of the diameter of the inscribed circle is corrected as follows.

As shown in FIG. 15, thickness T ₃ of the design _value, the inscribed circle radius R ₂ of the lower _side, a clearance angle theta, the thickness of the insert base material to be processed is larger than the design value T ₄ In this case, it is considered that the main cutting edge and the auxiliary cutting edge are processed so as to meet the design value. When the insert body S ₃ and the thickness of the insert preform design dimensions superposed lower surface 51a and side surfaces of a thin insert body 50 than the design value, as shown in FIG. 16, the upper surface 51a side of the side surface of the insert body 50 The one side of the is protruding. The amount of protrusion _{x 3} is
x ₃ = (T ₄ −T ₃ ) tan θ
It becomes. Therefore, when the thickness of the insert body 50 is thicker than the design value, the inscribed circle radius is corrected so as to be smaller by x ₃ than the design value. Incidentally, when the thickness of the insert body 50 is thinner than the design value, the inscribed circle radius is corrected to be larger by x ₃ than the design value.

  In the above embodiment, the insert intermediate body is formed by correcting the design value of the inscribed circle radius from the difference between the thickness of the insert base material and the design value, but the inscribed circle radius as designed. An insert intermediate may be formed. In other words, the inscribed circle is machined as designed, and in machining the secondary cutting edge, it is corrected by the sum of the difference between the design value of the inscribed circle and the measured value and the correction value of the secondary cutting edge in the thickness measurement. Also good. At this time, for example, the insert body is formed in the procedure as shown in FIG.

First, similarly to the first embodiment described above, after the insert base material is carried in (step ST31 shown in FIG. 17), the thickness of the insert base material is measured (step ST32 shown in FIG. 17).
Next, the main cutting edge of the insert body is processed (step ST33 shown in FIG. 17), and the inscribed circle radius of the formed insert intermediate is measured (step ST34 shown in FIG. 17).
Then, it is determined whether or not the difference between the measured value of the inscribed circle radius and the design value is within a predetermined value (step ST35 shown in FIG. 17). In step ST35, when the difference between the measured value of the inscribed circle radius and the design value exceeds a predetermined value, the process returns to step ST33, and all the side surfaces of the insert intermediate are ground.
In step ST35, if the difference between the measured value of the inscribed circle radius and the design value is within a predetermined value, the distance from the center of the inscribed circle of the insert intermediate to the sub cutting edge is corrected based on this difference. (Step ST36 shown in FIG. 17). Here, the correction based on the difference between the thickness of the insert intermediate body measured in step ST32 and the thickness of the design value is performed. Further, based on the difference between the measured value of the inscribed circle radius and the design value, the distance from the center of the inscribed circle of the insert base material to the corrected secondary cutting edge is corrected.
Next, the insert intermediate is ground based on the corrected design value to form a secondary cutting edge (step ST37 shown in FIG. 17). Then, the ground insert body is carried out (step ST38 shown in FIG. 17).
In step ST35, if the measured value of the inscribed circle radius is smaller than the corrected design value, the insert intermediate is discharged (step ST39 shown in FIG. 17), and the process ends.
The measured value of the thickness of the insert body and the data of each correction amount are recorded in the control panel, and are reflected when the next insert base material is processed.
In such a method for forming the insert body, as described above, an insert capable of performing stable workpiece processing without variation in the distance between the cutting edge position and the holder shaft when mounted on the holder. Can be formed. However, the deviation of the length of the auxiliary cutting edge from the design value is less likely to be suppressed compared to the above embodiment.
Here, the thickness measurement may be performed before correcting the distance from the center to the secondary cutting edge, and may be performed after the main cutting edge processing, and the inscribed circle radius of the insert body was measured. It may be done later. Moreover, you may apply to the insert main body in which the round corner was formed like 2nd Embodiment mentioned above.

Moreover, although each insert main body has substantially rectangular shape, other shapes, such as triangular shape, may be sufficient.
The insert base material here may be polished on both upper and lower surfaces, or may not be polished, and only one of the surfaces may be polished.
Although the thickness of the insert base material is measured when clamped by a clamp member, it may be measured by measuring the thickness in advance and inputting the measured value to the control panel. The thickness may be measured by separately providing a thickness measuring means.
Moreover, although the numerically controlled grinding machine includes a conveyor and a collection disk, the insertion of the insert base material and the removal of the insert main body may be performed by a robot.
In the first embodiment, the main cutting edge formation control unit and the sub cutting edge control unit are provided separately, but one function having the functions of the main cutting edge formation control unit and the sub cutting edge control unit is provided. It is good also as a structure provided with the control part. Similarly, in 2nd Embodiment, it is good also as a structure provided with one control part which has a function of a main cutting blade formation control part and a round corner formation control part.
Moreover, in 2nd Embodiment, although the round corner is formed only in one place, you may form in multiple places. In this case, after forming one round corner, the grinding wheel is retracted from the insert body by rapid return, and the grinding of the remaining round corners is performed in the same manner as described above while rotating the insert body by 90 °. To do. In this way, round corners are formed at a plurality of locations.

The insert in the 1st Embodiment of this invention is shown, (a) is a top view, (b) is a side view. 1 is a schematic diagram showing a numerically controlled grinding machine according to a first embodiment of the present invention. It is a top view which shows the workpiece clamp apparatus and grinding wheel of FIG. It is explanatory drawing which shows the measuring device of FIG. It is a flowchart which shows the outer periphery grinding method of the insert in 1st Embodiment. It is a side view which shows the insert main body from which thickness differs. It is explanatory drawing for demonstrating the principle of correction | amendment of an inscribed circle radius. It is a figure which shows the grinding method of the main cutting edge. It is explanatory drawing for demonstrating the principle of correction | amendment of a subcutting blade position. The insert in the 2nd Embodiment of this invention is shown, (a) is a top view, (b) is a side view. It is this schematic diagram which shows the numerical control grinding machine in the 2nd Embodiment of this invention. It is a flowchart which shows the outer periphery grinding method of the insert in 2nd Embodiment. It is explanatory drawing for demonstrating the principle of correction | amendment of a round corner. Similarly, it is explanatory drawing for demonstrating the principle of correction | amendment of a round corner. It is a side view which shows the insert main body from which thickness which can apply this invention other than embodiment of this invention differs. It is explanatory drawing for demonstrating the principle of correction | amendment of the inscribed circle radius which can apply this invention except embodiment of this invention. It is a flowchart which shows the outer periphery grinding method of the insert which can apply this invention other than embodiment of this invention.

Explanation of symbols

1, 40 Insert body 20, 45 Numerical control grinding machine (peripheral grinding device)
22 Measuring device (measuring means)
23, 46 Control panel (control means)
24 Work clamping device (clamping means)
26 Wheel head (grinding means)
36 Main cutting edge formation control part 37 Sub cutting edge formation control part 47 Round corner formation control part W Insert base material

Claims (8)

Using a numerically controlled grinding machine, a plate-like insert base material is sandwiched, and a center reference with the insert body having a main cutting edge and a secondary cutting edge as a cross ridge line portion between the upper surface and the side surface as the center of the upper surface. In the outer periphery grinding method of the insert formed by grinding with
Measure the thickness of the insert base material, correct the design value of the diameter of the inscribed circle of the insert body based on the difference between the measured value and the design value of the thickness,
After forming the insert intermediate body by grinding the insert base material on the basis of the center to form either or both of the main cutting edge and the outer periphery,
Measure the diameter of the inscribed circle of the insert intermediate, from the difference between the measured value of the inscribed circle and the corrected design value and the measured value of the thickness of the insert base material and the difference of the design value, While calculating the grinding trajectory of the secondary cutting edge with respect to the center of the insert intermediate as a central reference trajectory, calculating the movement distance when the central reference trajectory is set as a side reference,
With respect to the calculated center reference trajectory, from the difference between the measured value of the inscribed circle and the corrected design value, the measured value of the thickness of the insert base material, the difference of the design value, and the moving distance, the insert wherein the center of the intermediate corrected distance in the auxiliary cutting edge or outer peripheral grinding method of the insert, which comprises carrying out the grinding of the sub cutting blade. Using a numerically controlled grinding machine, a plate-like insert base material is sandwiched, and a center reference with the insert body having a main cutting edge and a secondary cutting edge as a cross ridge line portion between the upper surface and the side surface as the center of the upper surface. In the outer periphery grinding method of the insert formed by grinding with
Forming an insert intermediate by grinding the insert base material on a center basis to form either or both of the main cutting edge and the outer periphery,
The diameter of the inscribed circle of the insert intermediate is measured, the difference between the measured value and the design value of the diameter of the inscribed circle, and the difference between the measured value and the design value of the thickness of the insert base material or the insert intermediate From the calculation of the grinding trajectory of the secondary cutting edge with respect to the center of the insert intermediate as a central reference trajectory, and the movement distance when the central reference trajectory is set as a side reference,
With respect to the calculated center reference trajectory, the difference between the measured value and the design value of the inscribed circle, the measured value and the design value of the thickness of the insert base material or the insert intermediate, and the moving distance, periphery grinding method inserts the correct distance from the center of the insert intermediate said at minor cutting edge until, and performing grinding of sub cutting edge. A plate-shaped insert base material is sandwiched using a numerically controlled grinding machine, and an insert body having a round corner, which is at least a part of an intersection ridge line portion between the upper surface and the side surface, is ground with a center reference based on the center of the upper surface. In the outer peripheral grinding method of the insert to be formed,
Measure the thickness of the insert base material, correct the design value of the diameter of the inscribed circle of the insert body based on the difference between the measured value and the design value of the thickness,
After forming the insert intermediate body by grinding the insert base material on the basis of the center to form either or both of the main cutting edge and the outer periphery,
Measure the diameter of the inscribed circle of the insert intermediate, from the difference between the measured value of the inscribed circle and the corrected design value and the measured value of the thickness of the insert base material and the difference of the design value, The position of the round corner of the insert body is corrected on the basis of the outer periphery, the corner radius is corrected so that the round corner is formed continuously with the adjacent outer periphery, and the round corner is ground. The outer periphery grinding method of insert. A plate-shaped insert base material is sandwiched using a numerically controlled grinding machine, and an insert body having a round corner, which is at least a part of an intersection ridge line portion between the upper surface and the side surface, is ground with a center reference based on the center of the upper surface. In the outer peripheral grinding method of the insert to be formed,
Forming an insert intermediate by grinding the insert base material on a center basis to form either or both of the main cutting edge and the outer periphery,
The diameter of the inscribed circle of the insert intermediate is measured, and the difference between the measured value and the design value of the inscribed circle diameter is different from the measured value and the designed value of the thickness of the insert base material or the insert intermediate. The position of the round corner of the insert body is corrected with reference to the outer periphery, the corner radius is corrected so that the round corner is formed continuously with the adjacent outer periphery, and the round corner is ground. A method of grinding an outer periphery of an insert. Grinding means for grinding the insert main body having the main cutting edge and the auxiliary cutting edge which are the ridge line portion between the upper surface and the side surface with a center reference based on the center of the upper surface. And measuring means for measuring the diameter of the inscribed circle of the insert intermediate formed with either or both of the main cutting edge and the outer periphery, and control means for controlling these,
The control means corrects the design value of the diameter of the inscribed circle of the insert main body from the thickness of the insert base material, and the main cutting edge or the outer periphery is corrected with the corrected design value of the inscribed circle. A main cutting edge formation control unit for outputting a main cutting edge grinding signal for forming one or both to the grinding means;
Wherein relative to the center of the insert intermediate from the difference between the measured value and the corrected measured value of the thickness difference of the design value and the insert base material and the design value of the diameter of the inscribed circle of the insert intermediate The grinding trajectory of the secondary cutting edge is calculated as the center reference trajectory, the movement distance when the center reference trajectory is set as the side reference is calculated, and the measured value of the inscribed circle and the correction are performed with respect to the center reference trajectory. the distance of the at auxiliary cutting edge or from a center of said insert intermediate corrected based on the difference between the measured value and the design value of the thickness of the insert base material and the difference between the design value and the moving distance, and the corrected periphery grinding device of the insert, characterized in that it comprises a minor cutting edge formed control unit for outputting a secondary cutting edge grinding signal for grinding said grinding means sub cutting edge in position. Grinding means for grinding the insert main body having the main cutting edge and the auxiliary cutting edge which are the ridge line portion between the upper surface and the side surface with a center reference based on the center of the upper surface. And measuring means for measuring the diameter of the inscribed circle of the insert intermediate formed with either or both of the main cutting edge and the outer periphery, and control means for controlling these,
A main cutting edge formation control unit for outputting a main cutting edge grinding signal to the grinding means for forming the main cutting edge and / or the outer periphery at a design value by the control means;
From the difference between the measured value of the inscribed circle of the insert intermediate body and the design value, and the difference between the measured value of the insert base material or the thickness of the insert intermediate body and the design value, the center of the insert intermediate body is determined. The grinding trajectory of the secondary cutting edge as a reference is calculated as a center reference trajectory, the movement distance when the center reference trajectory is set as a side reference is calculated, and the measured value of the inscribed circle with respect to the center reference trajectory and the distance from the center of said insert intermediate said at auxiliary cutting edge or on the basis of the difference between the measured value and the design value of the thickness difference of the design value and the insert base material or the insert intermediate with the said moving distance An insert peripheral grinding apparatus, comprising: a secondary cutting edge formation control unit that corrects and outputs a secondary cutting edge grinding signal for grinding the secondary cutting edge at the corrected position to the grinding means. A sandwiching means for sandwiching the plate-shaped insert base material, and a grinding means for grinding an insert body having a round corner which is at least a part of an intersecting ridge line portion between the upper surface and the side surface with a center reference based on the center of the upper surface ; Measuring means for measuring the diameter of the inscribed circle of the insert intermediate formed with either or both of the main cutting edge and the outer periphery, and a control means for controlling these,
The control means corrects the design value of the diameter of the inscribed circle of the insert main body from the thickness of the insert base material, and the main cutting edge or the outer periphery is corrected with the corrected design value of the inscribed circle. A main cutting edge formation control unit for outputting a main cutting edge grinding signal for forming one or both to the grinding means;
The position of the round corner of the insert body is determined from the difference between the measured value of the inscribed circle of the insert intermediate and the corrected design value and the difference between the measured thickness and the design value of the insert base material. A round corner grinding signal for correcting the corner radius so that the round corner is formed continuously with the adjacent outer periphery and grinding the round corner with the corrected corner radius. An outer peripheral grinding device for an insert, comprising: a round corner formation control unit that outputs to A sandwiching means for sandwiching the plate-shaped insert base material, and a grinding means for grinding an insert body having a round corner which is at least a part of an intersecting ridge line portion between the upper surface and the side surface with a center reference based on the center of the upper surface ; Measuring means for measuring the diameter of the inscribed circle of the insert intermediate formed with either or both of the main cutting edge and the outer periphery, and a control means for controlling these,
A main cutting edge formation control unit for outputting a main cutting edge grinding signal to the grinding means for forming the main cutting edge and / or the outer periphery at a design value by the control means;
The position of the round corner of the insert body from the difference between the measured value and the design value of the inscribed circle diameter of the insert intermediate and the difference between the measured value and the design value of the thickness of the insert base material or the insert intermediate Is corrected based on the outer periphery reference, and the corner radius is corrected so that the round corner is formed continuously with the adjacent outer periphery, and the round corner grinding signal is used to grind the round corner with the corrected corner radius. An insert peripheral grinding device, comprising: a round corner formation control unit for outputting to a grinding means.

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