JP2009045675A - Device for measuring center height of cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and exactly measure the center height of a cutter on a machine tool. <P>SOLUTION: A device for measuring the center height of the cutter comprises a base portion 11 to be gripped by a main spindle chuck, a rotary body 12 to be supported by the base portion such that its axis becomes coaxial with the Z axis when the base portion has been gripped by the chuck, a gauge body 13 which is fixed to the rotary body, and has a gauge plane 13a which includes the Z axis, and elongates to the direction perpendicular to the Z axis, a first displacement sensor which is attached to a tool rest, and detects the deviation of the gauge plane with respect to the X axis by scanning the gauge plane 13a when a locking means 20a for fixing or releasing the rotary body with respect to the base portion and the tool rest 4 moves in parallel with the X axis, and a second displacement sensor 15 which is attached to the base portion, and detects the displacement of the other symmetrical position 23a of the gauge plane, as the center height, which displacement is caused by the contact of the cutter 28 with one symmetrical position 23b of the gauge plane with respect to the Z axis in the released state of the locking means after the main spindle has been turned based on the output of the first displacement sensor in the fixed state of the locking means such that the gauge plane coincides with the X axis. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for measuring a core height of a cutting tool such as a tool, a drill, a reamer, or a grindstone in a machine tool.

  FIG. 11 shows a conventional lathe. In FIG. 11, reference numeral 1 denotes a spindle stock with a built-in spindle (not shown), and a work 3 is fixed to the tip of the spindle by a chuck 2 provided at the tip of the spindle. A tool post 4 is installed beside the headstock 1. Reference numeral 2a denotes a claw of the chuck 2 that directly grips the workpiece. The tool post 4 in the illustrated example is a turret type, and a tool 6 as a tool is fixed to the tool post 4 via a tool holder 5. On a slant base 9 of the lathe, a horizontal rail 7 that extends parallel to the Z axis that is the axis of the main shaft, and a vertical rail that is slidably mounted on the horizontal rail 7 and extends parallel to the X axis perpendicular to the Z axis. 8 are provided. The turret 4a of the tool post 4 is installed on the vertical rail 8, moves on the horizontal rail 7 in parallel with the Z axis, and moves on the vertical rail 8 in parallel with the X axis. 3 peripheral surfaces and end surfaces are cut.

  When cutting the workpiece 3, as shown by a broken line in FIG. 12A, if the cutting edge 6a of the cutting tool 6 is above the Z axis, the workpiece 3 cannot be cut, and the Z axis is shown by a two-dot chain line. If it is below, an error occurs in the size and shape of the processed product, and the cutting edge 6a of the cutting tool 6 is also easily painful. On the other hand, if the cutting edge 6a of the cutting tool 6 matches the Z axis as shown by the solid line, the workpiece 3 can be cut accurately, and the cutting tool 6 also lasts longer.

  Thus, the distance H in which the cutting edge 6a of the cutting tool 6 is displaced from the Z axis in the vertical direction in the Y axis direction is the center height, and this is parallel to the X axis perpendicular to the Z axis, which is the axis of the spindle. In the case of movement, it is equal to the distance between the trajectory of the cutting edge 6a of the cutting tool 6 and the Z axis.

  In order to process the workpiece 3 with high accuracy using a lathe, it is necessary to adjust the position of the cutting tool 6 after the cutting tool 6 is attached to the tool post 4 to make the core height H zero. Conventionally, to make the core height H zero, as shown in FIGS. 12A and 12B, for example, the end surface of the workpiece 3 is cut to measure the diameter of the ridge-like protrusion 3a generated on the Z axis, A floor plate (not shown) having a desired thickness is sandwiched between the cutting tool 6 and the tool holder 5 so as to reduce the center height H by half. The core height H is brought close to zero by repeatedly cutting the protrusion 3a and adjusting the thickness of the bottom plate until the protrusion 3a disappears. Alternatively, by using a tool head having a special structure, the position of the cutting tool 6 is finely adjusted without using a slat, and the core height H is brought close to zero (see, for example, Patent Document 1).

  Further, it is desired that the center height H is not only zero for not only the cutting tool 6 but also a blade having a blade on a circumferential surface such as a drill or a reamer. That is, as shown in FIGS. 13 (A) and 13 (B), a path along which the cutting edge 10a of the drill 10 moves when the tool post 4 moves in parallel to the X axis perpendicular to the Z axis, which is the axis of the main shaft, If the center height H, which is the distance to the Z-axis, is not zero, as shown in the figure, a hole with a larger diameter will be drilled even if a hole with a diameter equal to the drill diameter is intended. It will be. Accordingly, the processing accuracy is lowered, and the blade of the drill 10 is easily painful. In order to make the center height H of a drill or the like zero, the turret 4 can be used if the eccentricity of the drill or the like is corrected by looking at the processing degree of the workpiece 3 or if the turret 4 has a Y-axis moving function. Is finely adjusted in the Y-axis direction.

  It has also been attempted to measure the core height H using a conventional core height measuring device. This is because a touch sensor having a circumferential surface eccentric by a predetermined amount from the Z-axis is attached to the tip of the main shaft, the main shaft is turned and the touch sensor is set in a predetermined direction with respect to the X-axis direction, and then the tool is moved to the X-axis. The X value is obtained by moving the blade in parallel and bringing the cutting edge into contact with the touch sensor, and the center height H is calculated from the X value, the diameter of the circumferential surface, and the amount of eccentricity (for example, , See Patent Document 2). According to the center height measuring device, the center height can be obtained easily and quickly without cutting the workpiece, and thus there is an advantage that the production efficiency is improved and the processing accuracy is improved.

Japanese Utility Model Publication No.57-57852 Japanese Patent No. 3071890

  However, the conventional center height measuring device is troublesome and inaccurate because the operation of turning the main shaft to set the touch sensor in a predetermined direction with respect to the X axis direction is likely to cause the X value to be inaccurate. There is also a problem that the measurement accuracy tends to decrease. There is also a problem that it is a large system of the entire machine including the NC device and lacks versatility. In addition, there is a problem that it is difficult to easily obtain the center height of a cutter having a blade on a circumferential surface such as a drill.

  Accordingly, an object of the present invention is to provide a center height measuring device that can solve such problems.

  In order to solve the above problems, the present invention employs the following configuration.

  In other words, the invention according to claim 1 is directed to the cutting edge (28, 29, 31) of the tool (28, 29, 31) when the tool rest (4) of the machine tool moves in parallel to the X axis perpendicular to the Z axis that is the axis of the spindle. 28a, 29a, 31b) In a center height measuring device that obtains the distance between the trajectory of movement and the Z axis as the center height (H), the base (11) gripped by the chuck (2) of the main shaft When the base (11) is gripped by the chuck (2), the rotating body (12) supported by the base so that the axis can be aligned with the Z-axis, and the rotating body (12) A gauge body (13) having a gauge surface (13a) including the Z axis and extending in a direction perpendicular to the Z axis, and the rotating body (12) are fixed to or integrated with the base (11). Locking means (20) for fixing or releasing with respect to the tool post (4) A first displacement attached to the tool rest (4) that scans the gauge surface (13a) when moving parallel to the X axis and detects a deviation of the gauge surface (13a) from the X axis. When the sensor (14) and the locking means (20) are in a fixed state, the main shaft is adjusted so that the gauge surface (13a) matches the X axis based on the output of the first displacement sensor (14). After being turned, the cutter (28, 29, 31) is placed at one symmetrical position (23b, 24b) of the gauge surface (13a) about the Z axis when the locking means (20) is in the released state. Attached to the base (11) for detecting the displacement of the other symmetrical position (23a, 24a) of the gauge surface (13a) caused by being applied as a core height (H) or as an amount for calculating the core height (H) The second Configured as comprising a displacement sensor (15).

  As described in claim 2, in the core height measuring device according to claim 1, the second displacement sensor is a dial gauge (15), and one of the gauge surfaces (13a) centered on the Z-axis. When the blade (28, 29, 31) is applied to the symmetrical position (23b, 24b) and the contact (15a) of the dial gauge (15) is applied to the other symmetrical position (23a, 24a), the dial The displacement of the gauge surface (13a) can be detected by the gauge (15).

  As described in claim 3, in the core height measuring device according to claim 1 or 2, the second displacement sensor (15) is along a direction perpendicular to the Z-axis of the gauge surface (13a). It can also be attached to the base (11) so that the position can be changed.

  As described in claim 4, in the core height measuring device according to any one of claims 1 to 3, the cutting tool is an outer diameter tool (28) or an inner diameter tool (29), and the second displacement The displacement of the gauge surface (13a) obtained by the sensor (15) can be set to the core height (H).

  As described in claim 5, in the core height measuring device according to any one of claims 1 to 3, the cutter (31) has a blade on its circumferential surface (31a), and the circumference The amount obtained by subtracting the radius of the blade (31) from the displacement of the gauge surface (13a) obtained by the second displacement sensor (15) by applying the surface (31a) to the gauge surface (13a) is the center height. It is also possible to set (H).

  As described in claim 6, in the core height measuring device according to any one of claims 1 to 5, the portion (11b) gripped by the chuck (2) of the main shaft in the base (11) is It is possible to detachably form the base (11) and to be formed to be equal to the diameter of the workpiece to be cut by the cutter (28, 29, 31) which is the core height measurement target. .

  The present invention has the following effects.

  That is, according to the first aspect of the invention, the tool (28, 29, 31) of the tool (28, 29, 31) when the tool rest (4) of the machine tool moves in parallel to the X axis perpendicular to the Z axis, which is the axis of the spindle. In a center height measuring device that obtains the distance between the trajectory of the cutting edge (28a, 29a, 31b) and the Z axis as the center height (H), the base (11) gripped by the chuck (2) of the main shaft ), A rotating body (12) supported by the base so that the axis can be aligned with the Z-axis when the base (11) is gripped by the chuck (2), and the rotating body (12 The gauge body (13) having a gauge surface (13a) including the Z axis and extending in a direction orthogonal to the Z axis, and the rotating body (12) are fixed to or integrated with the base ( 11) Locking means (20) for fixing or releasing with respect to the turret When 4) moves parallel to the X-axis, the gauge surface (13a) is scanned, and the tool surface (4) attached to the tool rest (4) detects the deviation of the gauge surface (13a) with respect to the X-axis. When the one displacement sensor (14) and the locking means (20) are in a fixed state, the gauge surface (13a) matches the X axis based on the output of the first displacement sensor (14). After the main shaft is rotated, the cutter (28, 29) is placed at one symmetrical position (23b, 24b) of the gauge surface (13a) about the Z axis when the locking means (20) is in the released state. , 31) to detect the displacement of the other symmetrical position (23a, 24a) of the gauge surface (13a) caused by being applied as the core height (H) or as an amount for calculating the core height (H) (11 Attached to) Since the second displacement sensor (15) is provided, the main shaft is rotated while observing the output of the first displacement sensor (14), and the gauge surface (13a) is precisely aligned with the X axis. Then, the lock means (20) is released, and the second displacement sensor (15) immediately sets the center height (H) or center height (only the center of the blade (28, 29, 31) to the gauge surface (13a). The amount for determining H) can be determined. Therefore, the center height (H) can be zero quickly and accurately.

  As described in claim 2, in the core height measuring device according to claim 1, the second displacement sensor is a dial gauge (15), and one of the gauge surfaces (13a) centered on the Z-axis. When the blade (28, 29, 31) is applied to the symmetrical position (23b, 24b) and the contact (15a) of the dial gauge (15) is applied to the other symmetrical position (23a, 24a), the dial When the displacement of the gauge surface (13a) is detected by the gauge (15), the center height (H) or the amount to calculate the core height (H) is immediately obtained by reading the scale of the dial gauge (15). be able to.

  As described in claim 3, in the core height measuring device according to claim 1 or 2, the second displacement sensor (15) is along a direction perpendicular to the Z-axis of the gauge surface (13a). In the case where it is attached to the base (11) so that the position can be changed, the second displacement sensor (15) is changed according to the change in the contact position of the cutter (28, 29, 31) with respect to the gauge surface (13a). Can be appropriately changed to a position symmetrical to the contact position of the blade (28, 29, 31).

  As described in claim 4, in the core height measuring device according to any one of claims 1 to 3, the cutting tool is an outer diameter tool (28) or an inner diameter tool (29), and the second displacement When the displacement of the gauge surface (13a) obtained by the sensor (15) is set to the core height (H), the core height of the outer diameter tool (28) or the inner diameter tool is immediately obtained by the second displacement sensor. The outer diameter bit or the inner diameter bit (29) can be quickly set to an appropriate position where the core height (H) is zero.

  As described in claim 5, in the core height measuring device according to any one of claims 1 to 3, the cutter (31) has a blade on its circumferential surface (31a), and the circumference The amount obtained by subtracting the radius of the blade (31) from the displacement of the gauge surface (13a) obtained by the second displacement sensor (15) by applying the surface (31a) to the gauge surface (13a) is the center height. If it is set as (H), center heights, such as a drill, a reamer, a small diameter grindstone, can be calculated | required immediately and a drill etc. can be set to the appropriate position where core height (H) is zero.

  As described in claim 6, in the core height measuring device according to any one of claims 1 to 5, the portion (11b) gripped by the chuck (2) of the main shaft in the base (11) is The chuck (2) is formed so as to be detachable with respect to the base (11) and is formed to be equal to the diameter of the workpiece to be cut by the blade (28, 29, 31) whose core height is to be measured. Since the present core height measuring device can be chucked as it is without exchanging the claws (2a), a more accurate core height can be measured quickly, and the processing accuracy can be further increased.

  The best mode for carrying out the invention will be described below with reference to the drawings.

  This center height measuring device is used when the tool post 4 of the machine tool moves in parallel with the X axis (see FIGS. 11 to 13) orthogonal to the Z axis (see FIGS. 11 to 13) which is the axis of the main shaft. This is a measuring device that obtains the distance between the trajectory of the cutting edge 6a of the blade 6 and the Z axis as the center height H.

  As shown in FIG. 6, the machine tool in this case is a lathe having a turret 4a on the tool post, and the tool post is provided with a slant base 9 for applying a slant θ. A spindle (not shown) is housed in the spindle stock 1, and a chuck 2 is attached to a location where the spindle protrudes from the spindle stock 1.

  As shown in FIG. 1 to FIG. 6, this center height measuring apparatus can have a base 11 gripped by the chuck 2 of the main shaft and an axis centered on the Z axis when the base 11 is gripped by the chuck 2. The rotating body 12 supported by the base 11 and the gauge body 13 having a gauge surface that is fixed to or integrated with the rotating body 12 and that extends in the direction perpendicular to the Z axis, including the Z axis, , A screw rod 20 which is a locking means for fixing or releasing the rotating body 12 with respect to the base 11, a dial gauge 14 which is a first displacement sensor attached to the tool post 4, and a second attached to the base 11. And a dial gauge 15 which is a displacement sensor 15.

  The base 11 includes a disk body 11a, a connecting shaft 11b fixed to the disk body 11a so as to protrude from the center of the disk body 11a to the main shaft side, and from the center of the disk body 11a to the opposite side of the main shaft. And a pivot 11c fixed to the disc body 11a so as to protrude.

  The connecting shaft 11b is formed in a round bar shape by cutting the workpiece 3, for example, and the boss portion 16 projects from the tip. The boss portion 16 is inserted into a connecting hole drilled in the center of the disc body 11a, and is tightened to a fixing screw 17 that is screwed into the disc body 11a in the radial direction from the peripheral surface thereof, thereby connecting the connecting shaft. 11b is fixed to the disc body 11a.

  Although the connecting shaft 11b can be formed integrally with the disk body 11a from the beginning, the connecting shaft 11b is desirably formed separately from the disk body 11a as shown in the illustrated example. Since the claw 2a (see FIG. 11) of the chuck 2 is prepared according to the diameter of each workpiece when high-precision machining is performed, the diameter of the connecting shaft 11b is also prepared with the same diameter for each workpiece and claw. It is desirable to replace the connecting shaft 11b with the base 11 every time the workpiece and the claw are changed. Thereby, the core height can be measured quickly and with higher accuracy.

  The pivot 11c is integrally formed with the disc body 11a from the beginning at the center of the disc body 11a. The connecting shaft 11b is connected to the disc body 11a so that its axis is on the same straight line as the axis of the pivot 11c. Of course, the pivot 11c may be formed separately from the disc body 11a and connected to the disc body 11a.

  In addition, a plate-like cantilever 18 protrudes from the peripheral surface of the disc body 11a of the base 11 longer than the pivot 11c in parallel to the pivot 11c.

  The base 11 is fixed to the tip of the main shaft by the connecting shaft 11b being gripped by the chuck 2 of the main shaft, and the axes of the connecting shaft 11b and the pivot 11c of the base 11 are aligned with the Z axis of the main shaft.

  The rotating body 12 is formed in a cylindrical shape having a smaller diameter than the disc body 11a of the base portion 11, and is rotatably held on a pivot 11c of the base portion 11 via a ball bearing 19 as a bearing. Thus, when the base 11 is gripped by the chuck 2, the axis of the rotating body 12 also matches the axis of the pivot 11c and the Z axis.

  The locking means is formed as a threaded rod 20 with a knob 20a. The screw rod 20 is screwed into the cantilever 18 of the base 11, and the knob 20a fixed to the projecting portion of the screw rod 20 on the cantilever 18 is turned in either direction, whereby the screw rod 20 is screwed back and forth with respect to the peripheral surface of the rotating body 12. When the screw rod 20 is advanced and its tip is pressed against the circumferential surface of the rotating body 12, the rotating body 12 is fixed to the base 11, and the screw rod 20 is retracted to move its tip from the circumferential surface of the rotating body 12. When pulled apart, the rotating body 12 is released from the base 11 and is rotatable about the pivot 11c.

  The gauge body 13 has a disk portion having a smaller diameter than the disk body 11 a of the base portion 11. A fitting recess 13b into which the front end of the rotating body 12 is fitted is formed on the back surface of the disk portion. The front end of the rotating body 12 is inserted into the fitting recess 13 b of the disk portion, and the tip of a set screw 21 screwed into the disk portion from the circumferential surface toward the inside in the radial direction is formed on the circumferential surface of the rotating body 12. By touching, the gauge body 13 is fixed to the rotating body 12. The gauge body 13 can be formed integrally with the rotating body 12 from the beginning.

  A protrusion 22 is integrally formed on the gauge body 13 so as to cross the front center of the disk portion and protrude from the periphery of the disk portion, and a gauge surface 13 a is formed on the upper surface of the protrusion 22. . The gauge surface 13a can be formed by other methods such as forming a step on the disk portion without providing the protrusions 22 and forming the step on the step. The gauge surface 13a is formed as a smooth surface including the axis of the rotating body 12 and the Z axis and extending in a direction perpendicular to the Z axis. The gauge surface 13a is preferably formed in a bilaterally symmetric shape with the Z axis as a symmetric axis. The gauge body 13 is integrally rotatable with the rotating body 12 and can be rotated around the Z-axis. The rotating movement enables the gauge surface 13a to swing in a seesaw shape with the Z-axis as a fulcrum. The gauge surface 13a is provided with two pairs of symmetrical positions with the Z axis as the symmetry axis. The pair of symmetrical positions is the corners 23a and 23b at both ends of the gauge surface 13a, and the other pair of symmetrical positions is the ridge 22. By cutting away the gage surface 13a partly, the corners 24a and 24b are formed at locations slightly closer to the Z axis than both ends of the gage surface 13a.

  The dial gauge 14 that is the first displacement sensor is detachably fixed to a desired location in the tool post 4 that moves parallel to the X axis. When the tool post 4 moves parallel to the X axis, the contact 14a of the dial gauge 14 scans the gauge surface 13a, and detects the deviation of the gauge surface 13a with respect to the X axis.

  Specifically, after the gauge body 13 and the rotating body 12 are fixed to the base 11 with the screw rod 20 as a locking means, the tool post 4 is moved parallel to the X axis, and the gauge 14 is moved by the contact 14a of the dial gauge 14. While scanning the surface 13a, the operator turns the main shaft little by little to reduce the deflection of the pointer (not shown) of the dial gauge 14. And when the pointer stops moving, the spindle is stopped. As a result, as shown in FIG. 6, the gauge surface 13a matches the X axis.

  The dial gauge 14 serving as the first displacement sensor is used to detect the deviation with respect to the X axis, and then removed from the tool post 4 as necessary.

  The dial gauge 15 as the second displacement sensor is held by an arm 25 connected to the tip of the cantilever 18 of the base 11. As shown in FIGS. 2 and 5, the arm 25 extends from right above the Z axis to one end of the ridge 22 along the gauge surface 13a. As shown in FIG. 5, a split groove is formed along the direction orthogonal to the Z-axis at a position near the tip of the arm 25, and the insertion holes 25 a and 25 b through which the shaft portion of the dial gauge 15 passes are formed in the split groove. Two corners 23a and 23b are formed correspondingly. The shaft part of the dial gauge 15 is fixed to the arm 25 by passing through one insertion hole 25a or 25b and being tightened by a tightening screw 26. And the contact 15a contacts the corner | angular part 23a or 24a of the gauge surface 13a.

  As is clear from FIG. 2, the arm 25 can be changed to either the left or right by removing the fixing screw 27 for fixing the arm 25 to the cantilever 18. In FIG. 2, when the arm 25 is attached so as to protrude to the right side, the dial gauge 15 can be set on the right side opposite to the Z axis of the gauge surface 13a. And the contact 15a contacts the corner | angular part 23b or 24b of the gauge surface 13a.

  As described above, when the screw rod 20 as the locking means is in the state of fixing the rotating body 12, the main shaft is adjusted so that the gauge surface 13a matches the X axis based on the output of the dial gauge 14 as the first displacement sensor. After being turned, it is stopped, but after that, when the locking means is in the released state, a cutting edge such as an outer diameter bit, an inner diameter bit or the like is applied to one symmetrical position of the gauge surface 13a around the Z axis, or a drill, When the gage surface 13a is inclined and displaced in the direction perpendicular to the X-axis by applying a circumferential surface such as a reamer or a small-diameter grindstone, the other symmetrical position is also displaced by the same amount, and this displacement is the second displacement sensor. Reading is possible by the pointer 15 b of the dial gauge 15. When the blade is an outer diameter bit or an inner diameter bit, the core height H can be read from the dial gauge 15. If the pointer 15b of the dial gauge 15 is set to zero before releasing the rotating body 12, the center height H can be read immediately. Further, when the blade is a drill, a reamer, or a small-diameter grindstone, it can be read as an amount for calculating the core height H. That is, the center height H can be obtained immediately by subtracting the radius of the cutter such as a drill from the reading value of the dial gauge 15.

  Next, the effect | action of the said core height measuring apparatus is demonstrated for every kind of cutter.

<For outside diameter tool>
(1) As shown in FIG. 6, the connecting shaft 11b of the base 11 of the core height measuring device is held by the chuck 2 of the main shaft. Thereby, the axial center of the connecting shaft 11b and the pivot 11c of the base 11 matches the Z-axis of the main shaft. The connecting shaft 11b is preferably cut out from the workpiece with the same diameter as that of the workpiece to be machined with an outer diameter tool that is symmetrical with respect to the core height.
The dial gauge 15 as the second displacement sensor may be fixed to the arm 25 in advance. Further, if necessary, the tightening screw 26 shown in FIG. 5 is loosened and the dial gauge 15 is replaced with another insertion hole 25a or 25b. Further, if necessary, the fixing screw 27 is removed, and the arm 25 is replaced in the opposite direction.

  (2) Hold the knob 20 a and turn the screw rod 20 in the tightening direction to fix the rotating body 12 to the base 11.

  (3) As shown in FIG. 6, the dial gauge 14 as the first displacement sensor is set on the tool post 4, and the tool post 4 is moved parallel to the X axis.

(4) In a normal case, as indicated by a two-dot chain line in FIG. 6, the gauge surface 13 a is initially slightly deviated from the X axis. When the tool post 4 moves parallel to the X axis, the contact 14a of the dial gauge 14 as the first sensor scans the gauge surface 13a, and detects the bias of the gauge surface 13a with respect to the X axis. On the other hand, the operator reduces the deflection of the pointer (not shown) of the dial gauge 14 while turning the spindle little by little. The rotation of the spindle and the movement of the tool rest 4 are repeated until the pointer does not swing. And when the pointer stops moving, the spindle is stopped. The main shaft is not moved until the measurement of the core height H is completed.
As described above, since the main shaft is rotated while observing the scale of the dial gauge 14 which is the output of the first displacement sensor, it is possible to accurately match the gauge surface 13a with the X axis as shown in FIGS. it can.
Subsequently, the pointer 15b of the dial gauge 15 as the second displacement sensor is set to zero on the scale. Moreover, the dial gauge 14 which is a 1st displacement sensor is removed from the tool rest 4 as needed. Thus, preparation for core height measurement is completed.

  (5) When measuring the core height H, the outer diameter cutting tool 28 to be measured is fixed to the tool post 4 as shown in FIG. Further, the gauge body 13 and the rotating body 12 are released from the base 11 by turning the knob 20a of the locking means so that the gauge body 13 and the rotating body 12 can rotate around the Z axis.

(6) The tool post 4 is moved in parallel to the X axis, and a predetermined corner 23b of the gauge surface 13a of the gauge body 13 is pressed against the cutting edge 28a of the outer diameter tool 28 as shown in FIGS. 8A and 8B. However, as shown in FIG. 8B, the corner 23b is in a symmetrical position with the Z-axis as the symmetry axis and the corner 23a with which the contact 15a of the dial gauge 15 as the second displacement sensor comes into contact. In FIG. 8B, symbol R ₀ indicates the distance from the Z axis to both corners.

  (7) When one corner 23b of the gauge surface 13a is pressed against the cutting edge 28a of the outer diameter cutting tool 28, the gauge body 13 and the rotating body 12 rotate around the axis of the pivot 11c and the Z axis, as shown in FIG. 8B. Thus, one corner 23b of the gauge surface 13a is pushed down. As a result, the gauge surface 13a is inclined and the corner portion 23b is displaced in a direction perpendicular to the X axis, that is, substantially parallel to the Y axis. Therefore, the other symmetrical corner portion 23a is also displaced by the same amount, and the second displacement The contact 15a of the dial gauge 15 as a sensor is pushed up. The displacement of the contact 15a is read by the pointer 15b of the dial gauge 15 which is the second displacement sensor to obtain a core height H.

  (8) A slab or the like (not shown) having a thickness close to the core height H is prepared, the height of the outer diameter bit 28 is adjusted, and the operation of (7) is performed again to form the second displacement sensor. The same operation is repeated until the pointer 15b of the dial gauge 15 indicates the scale zero.

(9) Thus, the position of the cutting edge 28a of the outer diameter cutting tool 28 is adjusted by the above operation (8), and the outer diameter cutting tool 28 is set on the tool post 4 with the center height H being zero. Become.
Thereafter, the claw of the chuck 2 of the main shaft is opened, and the center height measuring device is removed from the main shaft.

  (10) The workpiece 3 (see FIG. 11) is gripped by the chuck 2 of the main spindle, the workpiece 3 is rotated at a high speed, and the workpiece 3 is cut by the outer diameter tool 28 while moving the tool post 4 parallel to the X axis. The cutting edge 28a of the outer diameter cutting tool 28 whose core height H becomes zero moves on the X axis, and accurately cuts the workpiece 3.

<Inner diameter tool>
(1) The same operations as those in (1) to (4) in the case of the outer diameter tool 28 are performed to prepare for the core height measurement. If necessary, the tightening screw 26 is loosened and the dial gauge 15 as the second displacement sensor is replaced with another insertion hole 25a or 25b. Further, the fixing screw 27 is removed and the arm 25 is replaced between the left and right.

  (2) When measuring the core height H, the inner diameter tool 29 to be measured is fixed to the tool post 4. Further, the gauge body 13 and the rotating body 12 are released from the base 11 by turning the knob 20a of the locking means so that the gauge body 13 and the rotating body 12 can rotate around the Z axis.

  (3) The tool post 4 is moved in parallel with the X axis, and a predetermined corner 24b of the gauge surface 13a of the gauge body 13 is pressed against the cutting edge 29a of the inner diameter tool 29 as shown in FIGS. 9A and 9B. However, as shown in FIG. 9B, the corner portion 24b is in a symmetrical position with the corner portion 24a contacting the contact 15a of the dial gauge 15 as the second displacement sensor and the Z axis as an axis of symmetry. In FIG. 9B, symbol Ri indicates the distance from the Z axis to both corners 24a and 24b.

  (4) When the cutting edge 29a of the inner diameter tool 29 hits one corner 24b of the gauge surface 13a and presses the gauge surface 13a, the gauge body 13 and the rotating body 12 rotate around the axis of the pivot 11c and the Z axis. One corner 24b of the gauge surface 13a is pushed down like 9B. As a result, the gauge surface 13a is inclined and the corner portion 24b is displaced in a direction perpendicular to the X axis, that is, in a direction substantially parallel to the Y axis, and the other symmetrical corner portion 24a is also displaced by the same amount. The contact 15a of the dial gauge 15 which is a displacement sensor is pushed up. The displacement of the contact 15a is read by the pointer 15b of the dial gauge 15 which is the second displacement sensor, and the core height H of the inner diameter tool 29 is obtained.

  (5) Prepare a floor plate or the like (not shown) having a thickness close to the core height H, adjust the height of the inner diameter tool 29 in the direction parallel to the Y axis, and perform the operation (4) again. The same operation is repeated until the pointer 15b of the dial gauge 15, which is the second displacement sensor, indicates zero on the scale.

(6) The position of the cutting edge 29a of the inner diameter tool 29 is adjusted by the operation of (5) above, and the inner diameter tool 29 is set on the tool post 4 with the core height H being zero. .
The spindle chuck 2 is opened and the center height measuring device is removed from the spindle.

  (7) The workpiece 3 (see FIG. 11) is gripped by the chuck 2 of the main spindle, and the workpiece 3 is rotated at high speed, and the inner diameter portion of the workpiece 3 is cut by the inner diameter tool 29 while moving the tool post 4 parallel to the X axis. . The cutting edge 29a of the inner diameter cutting tool 29 whose core height H becomes zero moves on the X axis, and cuts the workpiece 3 accurately.

(8) If the inner diameter tool 29 is wrong, as shown in FIG. 9C, the center height measuring device is turned upside down by turning the main shaft or the like so that the gauge surface 13a faces downward, and its corner 24a Alternatively, the cutting edge 29a of the inner diameter tool 29 may be applied to 24b. As a result, the center height H can be reduced to zero by repeating operations such as inserting a base plate or the like until the pointer 15b of the dial gauge 15 as the second displacement sensor indicates zero on the scale in the same manner as described above. .
Further, as shown in FIG. 9D, the gauge surface 13a of the core height measuring device is left facing upward, the flat block 30 is applied to the gauge surface 13a, and the flat surface of the flat block 30 on the extended surface of the gauge surface 13a is applied. Even if the cutting edge 29a of the inner diameter tool 29 is applied, the core height H can be obtained and this core height H can be made zero. In this case, the core height H can be obtained more easily by adsorbing the flat block as a magnet to the gauge surface 13a.

<For drills>
(1) The same operations as those in (1) to (4) in the case of the outer diameter tool 28 are performed to prepare for the core height measurement. If necessary, the tightening screw 26 is loosened and the dial gauge 15 as the second displacement sensor is replaced with another insertion hole 25a or 25b. Further, the fixing screw 27 is removed and the arm 25 is replaced between the left and right.

  (2) When measuring the core height H, the drill 31 to be measured is fixed to the tool post 4. Further, the gauge body 13 and the rotating body 12 are released from the base 11 by turning the knob 20a of the locking means so that the gauge body 13 and the rotating body 12 can rotate around the Z axis.

(3) The tool post 4 is moved in parallel with the X axis, and as shown in FIGS. 10A and 10B, a predetermined angle on the gauge surface 13a of the gauge body 13 on the circumferential surface 31a on which the blade of the drill 31 is formed. The part 23b is pressed. However, as shown in FIG. 10B, the corner portion 23b is in a symmetrical position with the Z-axis as the symmetry axis and the corner portion 23a with which the contact 15a of the dial gauge 15 as the second displacement sensor comes into contact. In FIG. 10B, the symbol R ₀ indicates the distance from the Z axis to both corners 23a and 23b.

  (4) When the circumferential surface 31a of the drill 31 hits and presses one corner 23b of the gauge surface 13a, the gauge body 13 and the rotating body 12 rotate about the axis of the pivot 11c and the Z axis, as shown in FIG. 10B. One corner 23b of the gauge surface 13a is pushed down. As a result, when the gauge surface 13a is inclined and the corner 23b is displaced in a direction perpendicular to the X axis, that is, substantially parallel to the Y axis, the other symmetrical corner 23a is also displaced by the same amount. A contact 15a of a certain dial gauge 15 is pushed up. The displacement of the contact 15a is read by the pointer 15b of the dial gauge 15 which is the second displacement sensor, and the center height H of the drill 31 is calculated. When the radius (d / 2) of the drill 31 is subtracted from the value of the amount for determining the core height H, the core height H of the drill 31 is obtained. This center height H corresponds to the amount of misalignment of the drill 31 in the Y direction.

  (5) An operation for making the core height H zero is performed. Specifically, the gripping accuracy of the drill 31 by the tool post 4, the accuracy of the tool holder 5 that grips the drill 31, the center height of the tool base that fixes the tool holder 5, the indexing accuracy of the turret 4 a, and the like are confirmed and adjusted. Such adjustment and measurement of the center height H are repeated until the pointer 15b of the dial gauge 15 as the second displacement sensor indicates the radius of the drill 31. Since the pointer 15b of the dial gauge 15 indicates the radius of the drill 31, the cutting edge 31b which is the tip of the drill 31 matches the Z axis.

  (6) When the center height H becomes zero, the chuck 2 of the main shaft is opened and the center height measuring device is removed from the main shaft.

(7) The workpiece 3 (see FIG. 11) is gripped by the chuck 2 of the main spindle, the workpiece 3 is rotated at a high speed, and the tool post 4 is drilled from the end surface of the workpiece 3 with the drill 31 while moving in the Z-axis direction. Since the center height H becomes zero and the axis of the drill 31 coincides with the Z axis, the workpiece 3 is accurately cut.
In addition, since the reamer and the small-diameter grindstone are blades having blades on their circumferential surfaces, the core height H can be obtained in the same manner as in the case of the drill, and can be made zero similarly.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the machine tool using the center height measuring device has been described as a turret type lathe provided with a slant θ, but a turret type lathe without a slant or a comb type lathe can be used. Furthermore, it can be used for machine tools other than lathes. In addition, when a cutter such as a drill, reamer, or grindstone is rotated like an internal grinding machine or a rotary tool, the rotational deflection accuracy of the cutter can be measured by this center height measuring device. Further, the displacement sensor is not limited to the dial gauge, and other sensors can be substituted.

It is a perspective view which shows the one aspect | mode of the center height measuring apparatus which concerns on this invention. It is a front view of the center height measuring apparatus shown in FIG. It is a left view of the center height measuring apparatus shown in FIG. FIG. 2 is a vertical sectional view showing the core height measuring apparatus shown in FIG. 1 cut along a plane including a Z axis. It is a top view shown except a dial gauge in FIG. It is the figure which looked at the spindle stock and the tool post in the Z-axis direction. It is an enlarged view of the principal part in FIG. It is a perspective view which shows the core height measuring apparatus in measuring the core height of an outer diameter bite. It is the front view seen in the Z-axis direction in FIG. 8A. It is a perspective view which shows the core height measuring apparatus in measuring the core height of an internal diameter bit. It is the front view seen in the Z-axis direction in FIG. 9A. It is a perspective view which shows the core height measuring apparatus in the middle of measuring the core height of the internal diameter bite which is different. It is a perspective view which shows the core height measuring apparatus in the middle of measuring the core height of the internal diameter byte | piece by which it is different. It is a perspective view which shows the core height measuring apparatus in measuring the core height of a drill. It is the front view seen in the Z-axis direction in FIG. 10A. It is a perspective view which shows the spindle stock and the tool post of the conventional turret type lathe. (A) is the front view which looked at the workpiece | work from the end surface side with the outer diameter cutting tool, (B) is the side view which looked at the workpiece | work from the side surface. (A) is the front view which looked at the workpiece | work from the end surface side with the drill, (B) is the side view which looked at the workpiece | work from the side surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Chuck 4 ... Tool post 11 ... Base 11b ... Connecting shaft 12 ... Rotating body 13 ... Gauge body 13a ... Gauge surface 14, 15 ... Dial gauge 15a ... Dial gauge contact 20 ... Screw rod 23a, 23b, 24a, 24b ... Corner 28 ... Outer diameter tool 28a ... Outer diameter tool tip 29 ... Inner tool tool 29a ... Inner tool tool tip 31 ... Drill 31a ... Circumferential surface 31b ... Drill tip H ... Center height

Claims (6)

  Center height when the tool post of the machine tool moves parallel to the X axis perpendicular to the Z axis, which is the axis of the spindle, and the distance between the trajectory of the cutting edge of the tool and the Z axis is determined as the center height In the measuring apparatus, a base portion gripped by the chuck of the main shaft, a rotating body supported by the base portion so that the shaft center can be aligned with the Z-axis when the base portion is gripped by the chuck, and the rotation A gauge body having a gauge surface which is fixed to or integrated with the moving body and extends in a direction perpendicular to the Z axis including the Z axis; and a locking means for fixing or releasing the rotating body with respect to the base. A first displacement sensor attached to the tool post for scanning the gauge surface when the tool post moves parallel to the X axis and detecting a deviation of the gauge surface with respect to the X axis; and This is when the locking means is fixed One of the gauge surfaces centered on the Z-axis when the locking means is in the released state after the main shaft is rotated so that the gauge surface matches the X-axis based on the output of one displacement sensor. And a second displacement sensor attached to the base for detecting a displacement at the other symmetrical position of the gauge surface caused by being applied to the symmetrical position as a center height or an amount for determining the center height. A center height measuring apparatus characterized by that.   2. The center height measuring apparatus according to claim 1, wherein the second displacement sensor is a dial gauge, the cutter is applied to one symmetrical position of the gauge surface with respect to the Z axis, and the dial gauge is disposed to the other symmetrical position. The center height measuring device is characterized in that the displacement of the gauge surface is detected by the dial gauge when the contact is touched.   3. The lead height measuring device according to claim 1, wherein the second displacement sensor is attached to the base so that the position of the second displacement sensor can be changed along a direction perpendicular to the Z-axis of the gauge surface. High measuring device.   4. The center height measuring apparatus according to claim 1, wherein the cutter is an outer diameter tool or an inner diameter tool, and the displacement of the gauge surface obtained by the second displacement sensor is set as the core height. A center height measuring device characterized by the above.   The center height measuring device according to any one of claims 1 to 3, wherein the blade has a blade on its circumferential surface, and the circumferential surface is applied to the gauge surface to obtain the second displacement sensor. A center height measuring device characterized in that a center height is obtained by subtracting the radius of the blade from the displacement of the gauge surface.   6. The blade height measuring apparatus according to claim 1, wherein a portion of the base portion that is gripped by the chuck of the spindle is detachably formed with respect to the base portion, and the blade height measurement target. The center height measuring device is formed so as to be equal to the diameter of the workpiece to be cut by the above method.

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