JP5471055B2 - Grinding wheel forming method and grinding machine - Google Patents

Description

  The present invention relates to a method for forming a grindstone that can more appropriately shape the shape of the outer peripheral portion of a rotationally driven grindstone, and a grinder.

2. Description of the Related Art Conventionally, there has been known a ball screw grinding machine in which a grindstone that is rotationally driven is brought into contact with a workpiece to finish-grind a thread groove formed in the workpiece.
Here, FIGS. 8A to 8C show an example of a conventional grinding machine 100 (in this case, a ball screw grinding machine). FIG. 8A shows a plan view of the entire conventional grinder 100, and FIG. 8B is an enlarged view of the grinder 100 surrounding the truer 110 and a state where the grindstone T is formed by the truer 110. FIG. FIG. 8C shows an enlarged view of a state where the thread groove NM of the workpiece W is finish-ground with the grindstone T. FIG.
As shown in FIGS. 8A to 8C, the outer peripheral portion of the grindstone T is formed on an annular convex arc-shaped surface TM, and when many workpieces are ground, the outer periphery of the grindstone T Since the wear of the part gradually proceeds, the outer peripheral part of the grindstone T is regularly formed using the truer 110.
The outer peripheral surface of the truer 110 is formed into an annular concave arc-shaped surface 110M having an ideal arc shape on the outer peripheral portion of the grindstone T. By forming the outer peripheral portion of the grindstone T with the truer 110, the truer The arc shape of 110 concave arc-shaped surfaces 110M is transferred to the outer periphery of the grindstone T.
In this specification, both “so-called“ truing ”” for adjusting the outer shape of the grindstone T and “so-called“ dressing ”for sharpening the abrasive grains on the surface of the grindstone T are included in“ molding ”.
In the case of using a so-called total-type truer that forms the grindstone T by transferring the truer shape to the grindstone T, it is necessary to accurately position the grindstone T at the position of the truer.

Therefore, in the conventional grinding machine described in Patent Document 1, in order to accurately position the outer peripheral portion of the grindstone to the truer, the end face detection pin S1 for detecting the position of the end face of the grindstone in the workpiece rotation axis direction (FIG. 8 (B)), a cylindrical surface detection pin S2 (see FIG. 8 (B)) for detecting the tip position of the grindstone in a direction orthogonal to the workpiece rotation axis, and a contact for detecting contact between the grindstone and each pin. There is disclosed a grindstone correcting device in which a detection sensor (for example, an acoustic emission sensor) or the like is provided in a spindle housing.
The conventional grinding machine described in Patent Document 2 includes a grinding wheel and a truing roll to be formed, and a contact detection roll that contacts the grinding wheel and measures the diameter of the grinding wheel, and the grinding wheel and the contact detection roll before and after truing. The grinding machine which can obtain | require the actual truing amount using this and can grasp | ascertain the diameter of the grindstone after truing more correctly is disclosed.

JP-A-9-11128 JP 2008-302466 A

As shown in FIG. 8C, when the grinding groove T of the workpiece W is finish-ground with the grindstone T whose outer peripheral portion has a convex arc-shaped surface, the region TR1 which is the outermost peripheral portion of the grindstone T Often does not contact W. That is, even if the diameter of the outermost periphery of the grindstone T is measured, the wear amount of the grindstone T cannot be measured more accurately. In this case, the region of the grindstone T that is most worn out is not the outermost region TR1, but the region TRL and the region TRR adjacent to the region TR1.
Therefore, in order to determine whether or not the grinding wheel T should be formed (whether or not the wear amount has reached a predetermined amount), it is preferable to measure the wear amount in the regions TRL and TRR. With the detection pins and detection rolls disclosed in Document 1 and Patent Document 2, it is very difficult to measure the wear amount at the positions of the region TRL and the region TRR.
Furthermore, in Patent Document 1, as shown in FIG. 8 (B), the grindstone T is moved to the position of T (P1), the position of the end face of the grindstone T in the Z-axis direction is obtained, and the obtained (end face) Z is obtained. Based on the position in the axial direction and the position in the Z-axis direction of the truer 110 stored in advance, the position in the Z-axis direction of the grindstone T is positioned at a position facing the truer 110. However, since the distance in the Z-axis direction from the end surface detection pin S1 to the truer 110 is relatively long, the distance may change due to the occurrence of thermal displacement or the like depending on the state (temperature) of the grinding machine during molding. . In this case, a shift occurs in the Z-axis direction position of the grindstone T with respect to the truer 110, and it is necessary to mold it beyond the normal molding amount. This increases the molding time and shortens the life of the grindstone T, thereby increasing the molding cost. To do.
The present invention was devised in view of such points, and is capable of measuring the wear amount at a more appropriate position of the grindstone, and positioning the truer and the grindstone without being affected by thermal displacement. It is an object of the present invention to provide a method for forming a grindstone that can perform the above and a grinding machine.

As a means for solving the above-described problems, the method for forming a grindstone described in the present embodiment is a grindstone whose outer peripheral portion is formed on an annular convex arc-shaped surface and is driven to rotate around a grindstone rotation axis. And the outer peripheral portion is formed into an annular concave arc-shaped surface and is driven to rotate around a truer rotation axis parallel to the grindstone rotation axis, and the arc shape of the concave arc-shaped surface is rotated to the grindstone Forming the grindstone by transferring it to the outer periphery of the entire type of tool, and a control means capable of moving the grindstone relative to the total type of truer, and contact between the grindstone and the total type of truer. A method of forming a grindstone using a detectable contact detection means.
Each of the surfaces adjacent to the concave arc-shaped surface of the total-type truer in the direction of the true axis of rotation is a conical surface having an apex angle of a predetermined angle on the concave arc-shaped surface side. Formed on the surface and the second detection surface.
And the said control means moves the said grindstone relatively with respect to the said total type | mold truer so that the outer peripheral part of the said grindstone may be located between the said 1st detection surface and the said 2nd detection surface. And when the grindstone is reciprocated relatively to the truer rotation axis direction with respect to the total type truer, and the outer periphery of the grindstone is in contact with the first detection surface, the truer rotation axis direction of the grindstone A second step of obtaining a first detection position that is a position of the grindstone and a second detection position that is a position of the grindstone in the direction of the truer rotation axis when the outer peripheral portion of the grindstone contacts the second detection surface; The whetstone is moved in the direction of the truer rotation axis relative to the total-type truer so that the outer periphery of the whetstone is positioned at the midpoint between the first detection position and the second detection position. 3 steps and the total type truer Stones are relatively moved in the direction direction perpendicular and adjacent to said truer rotating shaft, having a fourth step of forming an outer peripheral portion of the grinding wheel at the concave arcuate surface of the total mold truer.

As means for solving the above-mentioned problems, the first invention of the present invention is a method for forming a grindstone as described in claim 1.
The method for forming a grindstone according to claim 1 includes a grindstone having an outer peripheral portion formed on an annular convex arc-shaped surface and being driven to rotate about a grindstone rotation axis, and an annular concave arc-shaped outer peripheral portion. The grindstone is rotated by being driven about a truer rotation axis that is formed on a surface and parallel to the grindstone rotation axis, and the arc shape of the concave arc-shaped surface is transferred to the outer periphery of the rotationally driven grindstone. A total type truer to be molded, a control unit capable of moving the grindstone relative to the total type truer, and a contact detection unit capable of detecting contact between the grindstone and the total type truer were used. This is a method for forming a grindstone.
Each of the surfaces adjacent to the concave arc-shaped surface of the total-type truer in the direction of the true axis of rotation is a conical surface having an apex angle of a predetermined angle on the concave arc-shaped surface side. Formed on the surface and the second detection surface.
And the said control means moves the said grindstone relatively with respect to the said total type | mold truer so that the outer peripheral part of the said grindstone may be located between the said 1st detection surface and the said 2nd detection surface. And when the grindstone is reciprocated relatively to the truer rotation axis direction with respect to the total type truer, and the outer periphery of the grindstone is in contact with the first detection surface, the truer rotation axis direction of the grindstone A second step of obtaining a first detection position that is a position of the grindstone and a second detection position that is a position of the grindstone in the direction of the truer rotation axis when the outer peripheral portion of the grindstone contacts the second detection surface; The whetstone is moved in the direction of the truer rotation axis relative to the total-type truer so that the outer periphery of the whetstone is positioned at the midpoint between the first detection position and the second detection position. 3 steps and the total type truer Stones are relatively moved in the direction direction perpendicular and adjacent to said truer rotating shaft, having a fourth step of forming an outer peripheral portion of the grinding wheel at the concave arcuate surface of the total mold truer.
In the control means, an ideal arc diameter of the convex arc-shaped surface of the grindstone is stored, and in the first step, a direction orthogonal to the truer rotation axis from the reference position is stored using the control means. In the second step, the grindstone is further moved relative to the total truer so that the tip of the outer peripheral portion of the grindstone is located at a position separated by a first predetermined distance. A wear amount of the outer peripheral portion of the grindstone is obtained based on the 1 detection position, the second detection position, the first predetermined distance, and the ideal arc diameter, and in the fourth step, the wear amount The cutting distance determined accordingly is moved, and the outer peripheral portion of the grindstone is formed on the concave arc-shaped surface of the total type truer.

A second invention of the present invention is a method for forming a grindstone as set forth in claim 2 .
The method for forming a grindstone according to claim 2 includes a grindstone having an outer peripheral portion formed on an annular convex arc-shaped surface and being driven to rotate around a grindstone rotation axis, and an annular concave arc-shaped outer peripheral portion. The grindstone is rotated by being driven about a truer rotation axis that is formed on a surface and parallel to the grindstone rotation axis, and the arc shape of the concave arc-shaped surface is transferred to the outer periphery of the rotationally driven grindstone. A total type truer to be molded, a control unit capable of moving the grindstone relative to the total type truer, and a contact detection unit capable of detecting contact between the grindstone and the total type truer were used. This is a method for forming a grindstone.
Each of the surfaces adjacent to the concave arc-shaped surface of the total-type truer in the direction of the true axis of rotation is a conical surface having an apex angle of a predetermined angle on the concave arc-shaped surface side. Formed on the surface and the second detection surface.
And the said control means moves the said grindstone relatively with respect to the said total type | mold truer so that the outer peripheral part of the said grindstone may be located between the said 1st detection surface and the said 2nd detection surface. And when the grindstone is reciprocated relatively to the truer rotation axis direction with respect to the total type truer, and the outer periphery of the grindstone is in contact with the first detection surface, the truer rotation axis direction of the grindstone A second step of obtaining a first detection position that is a position of the grindstone and a second detection position that is a position of the grindstone in the direction of the truer rotation axis when the outer peripheral portion of the grindstone contacts the second detection surface; The whetstone is moved in the direction of the truer rotation axis relative to the total-type truer so that the outer periphery of the whetstone is positioned at the midpoint between the first detection position and the second detection position. 3 steps and the total type truer Stones are relatively moved in the direction direction perpendicular and adjacent to said truer rotating shaft, having a fourth step of forming an outer peripheral portion of the grinding wheel at the concave arcuate surface of the total mold truer.
The control means stores an ideal arc diameter of the convex arc-shaped surface of the grindstone. In the fourth step, the grindstone is relative to the total type truer using the control means. When measuring, the measurement movement distance is a distance until the tip of the outer peripheral portion of the grindstone comes into contact with the concave arcuate surface of the total type truer, and the measurement movement distance, the first detection position, Based on the second detection position and the ideal arc diameter, the wear amount of the outer peripheral portion of the grindstone is obtained, and the cut-in distance obtained according to the wear amount is moved, so that the concave shape of the total type truer The outer peripheral part of the said grindstone is shape | molded by an arc-shaped surface.

The third invention of the present invention is a method for forming a grindstone as set forth in claim 3 .
The method for molding a grindstone according to claim 3 is the method for molding a grindstone according to claim 1 or 2 , wherein the fourth step is executed to form a concave arc-shaped surface of the total type truer. After forming the outer peripheral portion, the control means moves the grindstone relative to the total-type truer by a second predetermined distance in a direction perpendicular to and away from the truer rotation axis. A fifth step of positioning an outer peripheral portion of the grindstone between the first detection surface and the second detection surface; and reciprocating the grindstone in the direction of the truer rotation axis relative to the total type truer. A third detection position that is a position in the direction of the truer rotation axis of the grindstone when the outer periphery of the grindstone contacts the first detection surface, and the outer periphery of the grindstone is on the second detection surface. Position of the grindstone in the direction of the truer rotation axis when in contact Based on the sixth step for obtaining a fourth detection position, the third detection position, the fourth detection position, the second predetermined distance, and the ideal arc diameter, the grindstone after molding And a seventh step of obtaining the arc diameter of the convex arc-shaped surface of the outer peripheral portion of.

The fourth invention of the present invention is a method for forming a grindstone as set forth in claim 4 .
The method for forming a grindstone according to claim 4 is the method for shaping a grindstone according to any one of claims 1 to 3 , wherein each of the first detection surface and the second detection surface is formed. Each apex angle of the conical surface is 90 degrees.

The fifth invention of the present invention is a grinding machine as set forth in claim 5 .
The grinding machine according to claim 5 has a grindstone whose outer peripheral portion is formed in an annular convex arc-shaped surface and is driven to rotate around the grindstone rotation axis, and an outer peripheral portion is formed in an annular concave arc-shaped surface. The grindstone is formed by being driven to rotate around a truer rotation axis that is formed and parallel to the grindstone rotation axis, and transferring the arc shape of the concave arcuate surface to the outer periphery of the rotationally driven grindstone. , A total type truer, a moving means capable of moving the grindstone relative to the total type truer, a control means for controlling the moving means, and a contact between the grindstone and the total type truer can be detected. And a contact detection means.
Each of the surfaces adjacent to the concave arcuate surface of the total-type truer in the direction of the true axis of rotation is a conical surface having an apex angle of a predetermined angle on the concave arcuate surface side. A grinding machine which is formed on the detection surface and the second detection surface and forms the outer peripheral portion of the grindstone using the method for shaping a grindstone according to any one of claims 1 to 4 .

In the method for forming a grindstone according to claim 1 or 2 , a first-type detection position is formed using a total-type truer having a concave arc-shaped surface between a first detection surface and a second detection surface which are conical surfaces facing each other. By positioning the outer periphery of the grindstone at the midpoint of the second detection position, the truer and grindstone can be positioned without being affected by thermal displacement (positioning in the Z-axis direction in FIG. 2B). it can.

Further, according to the method for forming a grindstone according to claim 1, by using the first detection surface M1 and the second detection surface M2 which are conical surfaces in FIG. 2B, the grindstone T in FIG. The amount of wear in the region TRL and the region TRR can be appropriately detected (see FIGS. 5A and 5B).

Further, according to the method for forming a grindstone according to claim 2, the grindstone T in FIG. 8C is obtained by using the first detection surface M1 and the second detection surface M2 which are conical surfaces in FIG. The amount of wear in the regions TRL and TRR can be detected appropriately.

Further, according to the method for forming a grindstone according to claim 3, the shape of the region TRL and the region TRR of the grindstone after forming in FIG. 8C is formed to be close to the ideal shape. It can be confirmed appropriately.

According to the method for forming a grindstone according to claim 4, the inclination angles of the first detection surface and the second detection surface are determined based on the position of the region TRL and region TRR of the grindstone T where the wear should be detected and the detection result. It is possible to easily set the inclination angle so that the conversion into the amount, the conversion from the wear amount into the forming amount, and the like can be appropriately performed.

Moreover, according to the grinding machine of Claim 5, it is possible to measure the abrasion amount of the more suitable position of a grindstone, and to perform positioning of a truer and a grindstone without being influenced by thermal displacement. A grinder capable of being realized can be realized more easily.

It is the top view (A) and side view (B) explaining one embodiment of the grinding machine 1 of the present invention. It is a figure explaining the outer peripheral part TM of the grindstone T, and the external appearance shape of the truer TR. It is a flowchart explaining the example of the process sequence in 1st Embodiment of the shaping | molding method of the grindstone of this invention. It is a figure explaining the position of the outer peripheral part TM of the grindstone T, and the position of the truer TR in each step in the flowchart shown in FIG. It is a figure explaining the detail of how to obtain | require the abrasion loss of the outer peripheral part TM of the grindstone T. FIG. It is a flowchart explaining the example of the process sequence in 2nd Embodiment of the shaping | molding method of the grindstone of this invention. It is a flowchart explaining the example of the process sequence in 3rd Embodiment of the shaping | molding method of the grindstone of this invention. It is a figure explaining the conventional grinding machine 100, the conventional truer 110M, and the conventional shaping | molding method.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. FIG. 1A shows an example of a plan view in an embodiment of the grinding machine 1 of the present invention, and FIG. 1B shows an example of a right side view of the grinding machine 1. In FIG. 1B, the description of the spindle device (right) including the headstock (right) DR is omitted.
Moreover, in all drawings in which the X axis, the Y axis, and the Z axis are described, the X axis, the Y axis, and the Z axis are orthogonal to each other, the Y axis indicates a vertically upward direction, and the Z axis and the X axis Indicates the horizontal direction. The Z axis indicates the workpiece rotation axis direction, and the X axis direction indicates the direction in which the grindstone T is separated from the workpiece W.

● [Overall configuration of grinding machine 1 (FIGS. 1 (A), (B))]
As shown in FIGS. 1 (A) and 1 (B), the grinding machine 1 has a substantially cylindrical grindstone rotating about the grindstone rotation axis TZ with respect to the workpiece W rotating about the workpiece rotation axis WZ. The workpiece W is ground by moving T relatively. In addition, illustration is abbreviate | omitted about the control means (NC control apparatus etc.) which detects the position etc. of each movable body, and outputs a control signal to each drive motor. Both the workpiece rotation axis WZ and the grindstone rotation axis TZ are parallel to the Z axis.
The workpiece W is supported at both ends (or near both ends) by a spindle device (left) having a center member CL and a spindle device (right) having a center member CR (at least one chuck is used instead of the center member). May be).

The spindle device (left) includes a spindle base (left) DL mounted on a base BS, a spindle housing (left) HL that can reciprocate in the Z-axis direction with respect to the spindle base (left) DL, and a spindle housing (Left) A main shaft (left) SL supported rotatably around the workpiece rotation axis WZ in the HL. A center member CL is provided at one end of the main shaft (left) SL.
The main shaft (left) SL is provided with a drive motor (not shown), and the control means rotates the main shaft (left) SL around the work rotation axis WZ passing through the tip of the center member CL to an arbitrary angle at an arbitrary angular velocity. Can be made.
The same applies to the spindle device (right) including the headstock (right) DR, and the description of the spindle device (right) is omitted.
The control means can rotate the main shaft (left) SL and the main shaft (right) SR in synchronization.

Also, on the base BS, a grindstone slide table 40 that is positioned at an arbitrary position in the Z-axis direction along the guide GX according to the rotation angle of the ball screw NX controlled by the Z-axis drive motor MX is mounted. Is placed. The control means outputs a control signal to the Z-axis drive motor MX while detecting a signal from the position detection means EX such as an encoder.
Mounted on the grindstone slide table 40 is a grindstone advance / retreat table 41 positioned at an arbitrary position in the X-axis direction along the guide GZ according to the rotation angle of the ball screw NZ controlled by the X-axis drive motor MZ. Has been. The control means outputs a control signal to the X-axis drive motor MZ while detecting a signal from the position detection means EZ such as an encoder.

A grindstone drive motor MT that generates rotational power to the grindstone T is fixed to the grindstone advance / retreat table 41.
The grindstone drive motor MT is connected to the drive pulley 21, and the drive pulley 21 transmits rotational power to the driven pulley 24 via the belt 22. The driven pulley 24 is connected to one end of a grindstone shaft member that is rotatably supported in the shaft holder 25 around the grindstone rotation axis TZ, and the other end of the grindstone shaft member has a substantially disc-shaped grindstone T. Is connected.
Moreover, in the grinding machine 1 demonstrated in this Embodiment, although the support method of the grindstone T has shown the example of the cantilever type, you may support the grindstone T by a double-support type.

As shown in FIG. 1B, the grindstone rotation axis TZ and the workpiece rotation axis WZ are located on the virtual plane MF. In this state, the grindstone T is brought relatively close to the workpiece W, and a point on the grindstone T side at a position where the workpiece W and the grindstone T are in contact with each other is defined as a grindstone grinding point TP.
Further, the grinding machine 1 is provided with a coolant nozzle for supplying coolant in the vicinity of the grinding wheel grinding point TP (not shown).
Further, in the grinding machine 1 shown in the examples of FIGS. 1A and 1B, a truer TR (corresponding to the total type truer) for forming the grindstone T is attached to the main shaft housing (left) HL. Contact detection means AS is attached to TR. The contact detection means AS is, for example, an acoustic emission sensor, as long as it is provided at a position where the contact between the true TR and the grindstone T can be detected, and is provided on the grindstone slide table 40 or the like instead of the true TR. Also good.

● [Structure and shape of Truru TR (Fig. 2)]
As shown in FIGS. 2A and 2B, the truer TR is rotationally driven around the truer rotation axis RZ parallel to the grindstone rotation axis TZ.
Further, as shown in FIG. 2B, the truer surface M3 (corresponding to a concave arc-shaped surface) on the outer periphery of the truer TR is formed in an annular concave arc shape, and the annular convex arc shape is formed. It is formed in the ideal circular arc diameter of the outer peripheral part of the formed grindstone T. By transferring the shape of the truer surface M3 of the truer TR to the outer peripheral part of the grindstone T, the shape of the outer peripheral part of the grindstone T can be formed into a convex arc-shaped surface TM having an ideal arc diameter.

As shown in FIG. 2B, each of the surfaces adjacent to the truer surface M3 of the truer TR in the direction of the truer rotation axis RZ has a predetermined angle (vertical angle θ1, vertical angle θ2) on the truer surface M3 side. The first detection surface M <b> 1 and the second detection surface M <b> 2 are formed as respective conical surfaces having apex angles.
In the truer TR described in the present embodiment, the apex angle θ1 and the apex angle θ2 are both 90 degrees, and an angle formed by the truer rotation axis RZ and the first detection surface M1 (or the second detection surface M2). Is 45 degrees. This angle is a more preferable angle for the measurement of the region TRL and the region TRR shown in FIG. 8C and the calculation of the wear amount, but is not limited to this angle.

[Processing procedure of grinding wheel T forming method in the first embodiment (FIGS. 3 to 5)]
Next, the processing procedure of the method for forming the grindstone T in the first embodiment will be described with reference to FIGS.
The control means executes the forming process of the grindstone T according to the flowchart shown in FIG. 3 at a predetermined timing (for example, every time a predetermined number of workpieces are ground).

In step S10, the control means, as shown in FIG. 4A, the outer peripheral portion TM of the grindstone T enters the region K between the first detection surface M1 and the second detection surface M2. The grindstone T is moved relative to the truer TR, and the process proceeds to step S20.
In the first embodiment, the tip in the X-axis direction of the grindstone T from the reference position in the X-axis direction of the grinding machine 1 (the truer rotation axis RZ in the example of FIG. 4A) corresponds to the distance LX1 (first predetermined distance). ) To move the grindstone T relative to each other. This step S10 corresponds to the first step.

In step S20, the control means reciprocates the grindstone T relative to the truer TR in the direction of the truer rotation axis RZ as shown in FIG. In the first detection position, which is the position of the grindstone T when the detection surface M1 comes into contact with the contact P1, the distance in the Z-axis direction from the Z-axis direction reference position STZ of the grinder 1 to the center of the grindstone T (first The detection distance ZL) is obtained. Similarly, at the second detection position, which is the position of the grindstone T when the outer peripheral portion TM of the grindstone T and the second detection surface M2 are in contact with each other at the contact P2, the grindstone T from the Z-axis direction reference position STZ of the grinding machine 1 is used. The distance in the Z-axis direction (second detection distance ZR) to the center of is determined. Then, the process proceeds to step S21.
The Z-axis direction reference position STZ of the grinding machine 1 is, for example, the position of the tip of the center member CL in the Z-axis direction.

In step S21, the control means, as shown in FIGS. 5A to 5C, the distance LX1, the first detection distance ZL corresponding to the first detection position, and the second detection position corresponding to the second detection position. Based on the distance ZR and the ideal arc diameter R, the wear amount ΔR of the grindstone T is obtained, and the process proceeds to step S30.
In addition, about the abrasion amount (DELTA) R of the grindstone T, it calculates | requires as follows. 5B is an enlarged view around the contact point P2 in FIG. 5A, and FIG. 5C is an enlarged view of the triangle Tri in FIG. 5B.

When the arc shape of the outer peripheral portion of the grindstone T is an ideal arc diameter R, an ideal first detection position and an ideal second detection position at a distance LX1 from the reference position in the X-axis direction (in this case, a distance from the truer rotation axis RZ). When the diameter of the grindstone T is worn by ΔR as shown in FIG. 5B with respect to the ideal interval in the Z-axis direction by the Z-axis by the detected first detection position and the second detection position The direction spacing increases by 2 * ΔZR. It is assumed that the wear amount ΔR at the contact P2 is equal to the wear amount ΔR at the contact P1. In FIG. 5B, the point Ot is the center position of the arc of the convex arc-shaped surface of the grindstone T.
Further, when the tip of the grindstone T is at the position of the distance LX1, the interval in the Z-axis direction between the ideal first detection position and the ideal second detection position when the outer peripheral portion TM of the grindstone T has an ideal arc diameter R without wear. Is an ideal interval ZLR (typ).
In the control means, a distance LX1, an ideal arc diameter R, an ideal interval ZLR (typ) (at a distance LX1), and an angle θ3 (45 degrees in this case) are stored in advance.
And a control means can obtain | require 2 * (DELTA) ZR from the following formula | equation.
2 * ΔZR = (distance ZL−distance ZR) −ideal distance ZLR (type) (formula 1)
Further, from FIG. 5C, ΔR can be obtained from the following equation.
sin (θ3) = ΔR / ΔZR
ΔR = ΔZR / √2 (Formula 2)
The control means obtains the wear amount ΔR from (Equation 1) and (Equation 2), and proceeds to step S30.
As described above, steps S20 to S21 correspond to the second step.

In step S30, as shown in FIG. 4C, the control means moves the grindstone T with respect to the truer TR so that the tip of the grindstone T is located at the midpoint between the first detection position and the second detection position. Is relatively moved in the direction of the truer rotation axis RZ, and the process proceeds to step S40. In this case, the distance in the Z-axis direction from the Z-axis direction reference position STZ to the center of the grindstone T may be moved so as to be (distance ZL + distance ZR) / 2.
With this method, even if thermal displacement occurs, the tip of the grindstone T can be reliably positioned in the center of the concave arc-shaped surface M3 of the truer TR in the Z-axis direction.
This step S30 corresponds to the third step.

In step S40, the control means moves the grindstone T relative to the truer TR from the state shown in FIG. 4C in a direction perpendicular to and close to the truer rotation axis RZ. The outer peripheral portion TM of the grindstone T is formed with the arc-shaped surface M3, and the process proceeds to step S50.
In the control means, a distance LX2 from the reference position in the X-axis direction (in this case, the truer rotation axis RZ) to the concave arcuate surface M3 is stored in advance, and cutting is performed based on the distance LX1, the distance LX2, and the wear amount ΔR. The distance is obtained, and the grindstone T is moved relative to the truer TR in a direction perpendicular to the truer rotation axis RZ and in a direction close to the truer TR at the obtained cutting distance.
Step S40 corresponds to the fourth step.

In step S50, the control means causes the outer peripheral portion TM of the grindstone T after molding to enter the region K between the first detection surface M1 and the second detection surface M2 (see FIG. 4A). Then, the grindstone T is moved relative to the truer TR in a direction perpendicular to the truer rotation axis RZ and away from the truer by a second predetermined distance, and the process proceeds to step S60.
Step S50 corresponds to the fifth step.

  In step S60, the control means reciprocates the grindstone T relative to the truer TR in the direction of the truer rotation axis RZ, and the grindstone when the outer peripheral portion TM of the grindstone T and the first detection surface M1 come into contact with each other. At a third detection position that is a position of T, a distance in the Z-axis direction (third detection distance ZL3) from the Z-axis direction reference position STZ of the grinding machine 1 to the center of the grindstone T is obtained. Similarly, at the fourth detection position, which is the position of the grindstone T when the outer peripheral portion TM of the grindstone T and the second detection surface M2 are in contact, from the Z-axis direction reference position STZ of the grinder 1 to the center of the grindstone T. A distance in the Z-axis direction (fourth detection distance ZR4) is obtained. Then, the process proceeds to step S70. Step S60 corresponds to the sixth step.

In step S70, the control unit performs post-molding based on the second predetermined distance, the third detection distance ZL3 corresponding to the third detection position, the fourth detection distance ZR4 corresponding to the fourth detection position, and the ideal arc diameter R. The wear amount ΔR of the grindstone T is obtained. Step S70 corresponds to the seventh step.
The wear amount ΔR of the grinding wheel T after forming is substantially zero, but when the obtained wear amount ΔR is larger than a predetermined value, a cutting distance slightly larger than the cutting distance obtained in step S40 is set, and again, You may return to step S40 and shape | mold.

[Processing procedure of grinding wheel T forming method in the second embodiment (FIG. 6)]
Next, the processing procedure of the method for forming the grindstone T in the second embodiment of the method for forming the grindstone T will be described with reference to FIG. In the first embodiment, the distance LX1 (first predetermined distance) in FIG. 4 is known in advance, but in the second embodiment, the distance LX1 is not known in advance, and FIG. The difference is that the measured movement distance LX3 in C) is obtained and the wear amount ΔR is obtained in the fourth step.
Hereinafter, differences from the first embodiment will be mainly described.
The control means executes the forming process of the grindstone T according to the flowchart shown in FIG. 6 at a predetermined timing (for example, every time a predetermined number of workpieces are ground).

Step S10A is slightly different from step S10 shown in the first embodiment (FIG. 3). In the second embodiment, since the distance LX1 is not yet known, the control means moves the distance so that the tip of the grindstone T enters the region K.
In step S10A, as shown in FIG. 4A, the control means enters the region K between the first detection surface M1 and the second detection surface M2 so that the outer peripheral portion TM of the grindstone T enters the region K. The grindstone T is moved relative to the truer TR, and the process proceeds to step S20.
This step S10A corresponds to the first step.

Step S20 is the same as step S20 of the first embodiment shown in FIG. 3, and the control means sets the first detection position (first detection distance ZL) and the second detection position (second detection distance ZR). The process proceeds to step S30.
This step S20 corresponds to the second step.

Step S30 is the same as step S30 in the first embodiment shown in FIG. 3, and the control means is configured such that the tip of the grindstone T has a first detection position and a second detection position as shown in FIG. 4C. Then, the grindstone T is moved relative to the truer TR in the direction of the truer rotation axis RZ so as to be positioned at the midpoint between and the process proceeds to step S40A.
This step S30 corresponds to the third step.

Steps S40A to S45 are different from step S40 shown in the first embodiment (FIG. 3). Steps S40A to S45 correspond to the fourth step.
In step S40A, the control means moves the grindstone T relative to the truer TR from the state shown in FIG. 4C in a direction perpendicular to the truer rotation axis RZ and a direction close thereto. In the embodiment, the incision distance, which is the movement distance, is obtained and then moved by the incision distance. In the second embodiment, the measurement movement distance that is the distance until the grindstone T and the truer TR come into contact with each other. In order to obtain (measurement movement distance LX3 in FIG. 4C) (step S42), the movement is gradually performed while confirming the detection signal of the contact detection means AS, and the process proceeds to step S41.

In step S41, the control means determines whether or not the tip of the grindstone T in the X-axis direction is in contact with the concave arcuate surface M3 of the truer TR based on the detection signal of the contact detection means AS. When it determines with not contacting (No), it returns to step S40A. When it determines with contacting (Yes), it progresses to step S42.
When the process proceeds to step S42, the control unit moves the grindstone T relative to the truer TR in the direction perpendicular to the truer rotation axis RZ and comes into contact with the truer TR from the state shown in FIG. 4C. The measurement moving distance LX3, which is the distance up to, is obtained, and the process proceeds to step S43.

In the control means, a distance LX2, an ideal arc diameter R, and an angle θ3 (45 degrees in this case) are stored in advance.
In step S43, the control means is based on the distance LX2 and the measured movement distance LX3 in FIG. 4C, and is a position away from the X-axis direction reference position (in this case, the truer rotation axis RZ) by the distance LX2 + the measured movement distance LX3. Thus, an ideal interval ZLR (typ) in the Z-axis direction when the grindstone T having an ideal arc diameter comes into contact with the first detection surface M1 and the second detection surface M2 is obtained. Then, based on the measurement movement distance LX3, the distance LX2, the ideal arc diameter R, the ideal distance ZLR (type) (in the measurement movement distance LX3 + distance LX2), and the angle θ3 (45 degrees in this case), the first embodiment In the same manner as described above, the wear amount ΔR of the grindstone T is obtained, and the process proceeds to step S45.

In step S45, the control means moves the grindstone T relative to the truer TR in a direction perpendicular to and close to the truer rotation axis RZ, and the outer periphery of the grindstone T is formed on the concave arc-shaped surface M3 of the truer TR. The part TM is formed, and the process proceeds to step S50.
In step S43, since the grindstone T and the concave arc-shaped surface M3 of the truer TR are in contact with each other, the control means obtains a cutting distance based on the wear amount ΔR, and only the calculated cutting distance is applied to the truer TR. Then, the grindstone T is formed by being relatively cut in the X-axis direction.

  Henceforth, since step S50-step S70 are the same as that of 1st Embodiment, description is abbreviate | omitted.

● [Processing Procedure of Grinding Wheel T Forming Method in Third Embodiment (FIG. 7)]
Next, the processing procedure of the method for forming the grinding wheel T in the third embodiment of the method for forming the grinding wheel T will be described with reference to FIG. The third embodiment is the same as the first and second embodiments in that the center of the grindstone T coincides with the center of the concave arc-shaped surface M3 of the truer TR, but without obtaining the wear amount ΔR. The difference is that the grindstone T is molded with a preset depth of cut.
Hereinafter, differences from the first and second embodiments will be mainly described.
The control means executes the forming process of the grindstone T according to the flowchart shown in FIG. 7 at a predetermined timing (for example, every time a predetermined number of workpieces are ground).

Step S10 is the same as step S10 in FIG. 3 which is the first embodiment. The control means relatively moves the grindstone T so that the tip of the grindstone T in the X-axis direction is a distance LX1 (corresponding to a first predetermined distance) from the reference position in the X-axis direction of the grinding machine 1, and proceeds to step S20.
Step S20 is the same as step S20 in FIG. 3 which is the first embodiment. As in the first embodiment, the control means reciprocates the grindstone T relative to the truer TR in the truer rotation axis RZ direction so that the grindstone 1 moves from the Z-axis direction reference position STZ. A distance in the Z-axis direction (first detection distance ZL) to the center and a distance in the Z-axis direction (second detection distance ZR) from the Z-axis direction reference position STZ of the grinding machine 1 to the center of the grindstone T are obtained. Proceed to step S30.

Step S30 is the same as step S30 in FIG. 3 which is the first embodiment. As in the first embodiment, the control means moves the grindstone T to the truer rotation axis RZ with respect to the truer TR so that the tip of the grindstone T is located at the midpoint between the first detection position and the second detection position. The relative movement is made in the direction, and the process proceeds to step S40B.
In step S40B, the control means forms the grindstone T by cutting a preset molding amount ΔL. In this case, after the state of FIG. 4C in step S30, in step S40B, the cutting amount = distance LX1-distance LX2 + ΔL, and the grinding wheel T is moved relative to the truer TR by this cutting amount, and the forming amount ΔL Only the grinding wheel T is cut and molded.

As described above, in the method for forming a grindstone described in the first to third embodiments, the grindstone is located at the center (center in the Z-axis direction) of the concave arc-shaped surface M3 of the truer TR without being affected by thermal displacement. Since the centers of T can be matched, the convex arc shape of the grindstone T can be formed more accurately.
Further, in the method for forming a grindstone described in the first and second embodiments, the wear amount ΔR of the grindstone T in the regions TRL and TRR in FIG. 8 can be detected, so that the grindstone can be more appropriately used. T wear can be detected.

The grinding wheel molding method and grinding machine of the present invention are not limited to the processing procedures and methods described in the present embodiment, and various modifications, additions and deletions are possible without departing from the spirit of the present invention. .
The contact detection means AS may be provided anywhere on the grinding machine 1 as long as the contact between the grindstone T and the truer TR can be detected.
In the description of the present embodiment, the apex angle θ1 of the cone having the first detection surface M1 and the apex angle θ2 of the cone having the second detection surface M2 are set to 90 degrees, but are limited to this angle. It is not a thing.
Further, the above (≧), the following (≦), the greater (>), the less (<), etc. may or may not include an equal sign.
The numerical values used in the description of the present embodiment are examples, and are not limited to these numerical values.

DESCRIPTION OF SYMBOLS 1 Grinding machine 25 Axis holder 40 Wheel slide table 41 Wheel advance / retreat table AS Contact detection means BS Base CL, CR Center member LX1 Distance (first predetermined distance)
LX3 Measuring distance MT Wheel driving motor MX Z-axis driving motor MZ X-axis driving motor M1 First sensing surface M2 Second sensing surface M3 Concave arc-shaped surface GX, GZ Guide SL, SR Main shaft (left), Main shaft (right)
R Ideal arc diameter ΔR Wear amount RZ Truer rotation axis T Grinding stone TM Outer peripheral part (convex arc-shaped surface)
TP grinding wheel grinding point TR
TZ Wheel rotation axis W Work WZ Work rotation axis ZL First detection distance (first detection position)
ZR second detection distance (second detection position)

Claims (5)

A grindstone whose outer peripheral portion is formed in an annular convex arc-shaped surface and is driven to rotate around a grindstone rotation axis;
An outer peripheral portion is formed in an annular concave arc-shaped surface and is driven to rotate around a truer rotation axis parallel to the grindstone rotation axis. Forming the grindstone by transferring it to the part,
Control means capable of moving the grindstone relative to the total type truer;
A contact detection means capable of detecting contact between the grindstone and the total type truer, and a method for forming a grindstone using the grindstone,
Each of the surfaces adjacent to the concave arc-shaped surface of the total-type truer in the direction of the true axis of rotation is a conical surface having an apex angle of a predetermined angle on the concave arc-shaped surface side. Formed on the surface and the second detection surface,
In the control means,
A first step of moving the grindstone relative to the total type truer so that an outer peripheral portion of the grindstone is located between the first detection surface and the second detection surface;
The position of the grindstone in the direction of the truer rotation axis when the grindstone is reciprocated in the direction of the truer rotation axis relative to the total type truer and the outer periphery of the grindstone contacts the first detection surface. A second step for obtaining a first detection position, and a second detection position that is a position in the direction of the truer rotation axis of the grindstone when an outer peripheral portion of the grindstone contacts the second detection surface;
A third wheel that moves the grindstone relative to the total-type truer in the direction of the truer rotation axis so that the outer periphery of the grindstone is positioned at the midpoint between the first detection position and the second detection position. Steps,
The grindstone is moved relative to the true-type truer in a direction perpendicular to and close to the truer rotation axis, and the outer peripheral portion of the grindstone is formed by the concave arc-shaped surface of the true-type truer. Steps, and
The control means stores an ideal arc diameter of the convex arc-shaped surface of the grindstone,
Using the control means,
In the first step, the grindstone with respect to the total type truer is positioned such that the tip of the outer peripheral portion of the grindstone is located at a position separated by a first predetermined distance from a reference position in a direction orthogonal to the truer rotation axis. Relatively move
In the second step, the wear amount of the outer peripheral portion of the grindstone is further obtained based on the first detection position, the second detection position, the first predetermined distance, and the ideal arc diameter,
In the fourth step, the cutting distance determined according to the amount of wear is moved, and the outer peripheral portion of the grindstone is formed on the concave arc-shaped surface of the total type truer.
Grinding wheel forming method. A grindstone whose outer peripheral portion is formed in an annular convex arc-shaped surface and is driven to rotate around a grindstone rotation axis;
An outer peripheral portion is formed in an annular concave arc-shaped surface and is driven to rotate around a truer rotation axis parallel to the grindstone rotation axis. Forming the grindstone by transferring it to the part,
Control means capable of moving the grindstone relative to the total type truer;
A contact detection means capable of detecting contact between the grindstone and the total type truer, and a method for forming a grindstone using the grindstone,
Each of the surfaces adjacent to the concave arc-shaped surface of the total-type truer in the direction of the true axis of rotation is a conical surface having an apex angle of a predetermined angle on the concave arc-shaped surface side. Formed on the surface and the second detection surface,
In the control means,
A first step of moving the grindstone relative to the total type truer so that an outer peripheral portion of the grindstone is located between the first detection surface and the second detection surface;
The position of the grindstone in the direction of the truer rotation axis when the grindstone is reciprocated in the direction of the truer rotation axis relative to the total type truer and the outer periphery of the grindstone contacts the first detection surface. A second step for obtaining a first detection position, and a second detection position that is a position in the direction of the truer rotation axis of the grindstone when an outer peripheral portion of the grindstone contacts the second detection surface;
A third wheel that moves the grindstone relative to the total-type truer in the direction of the truer rotation axis so that the outer periphery of the grindstone is positioned at the midpoint between the first detection position and the second detection position. Steps,
The grindstone is moved relative to the true-type truer in a direction perpendicular to and close to the truer rotation axis, and the outer peripheral portion of the grindstone is formed by the concave arc-shaped surface of the true-type truer. Steps, and
The control means stores an ideal arc diameter of the convex arc-shaped surface of the grindstone,
Using the control means,
In the fourth step, when the grindstone is relatively moved with respect to the total-type truer, the measurement is a distance until the tip of the outer peripheral portion of the grindstone contacts the concave arc-shaped surface of the total-type truer The movement distance is obtained, the amount of wear of the outer peripheral portion of the grindstone is obtained based on the measured movement distance, the first detection position, the second detection position, and the ideal arc diameter, and the amount of wear is calculated. The cutting distance determined accordingly is moved, and the outer peripheral portion of the grindstone is molded with the concave arc-shaped surface of the total type truer.
Grinding wheel forming method. A method for forming a grindstone according to claim 1 or 2 ,
After the fourth step is performed and the outer peripheral portion of the grindstone is formed on the concave arc-shaped surface of the total type truer,
In the control means,
The grindstone is relatively moved by a second predetermined distance in a direction perpendicular to and away from the truer rotation axis with respect to the total-type truer, and the outer peripheral portion of the grindstone after molding is moved to the first detection surface. A fifth step positioned between the second detection surface and
The position of the grindstone in the direction of the truer rotation axis when the grindstone is reciprocated in the direction of the truer rotation axis relative to the total type truer and the outer periphery of the grindstone contacts the first detection surface. A sixth detection position, and a fourth detection position that is a position in the direction of the truer rotation axis of the grindstone when the outer peripheral portion of the grindstone contacts the second detection surface;
Based on the third detection position, the fourth detection position, the second predetermined distance, and the ideal arc diameter, the arc diameter of the convex arc-shaped surface of the outer peripheral portion of the grindstone after molding is obtained. And a seventh step.
Grinding wheel forming method. A method for forming a grindstone according to any one of claims 1 to 3 ,
The apex angle of each conical surface forming the first detection surface and the second detection surface is 90 degrees, respectively.
Grinding wheel forming method. A grindstone whose outer peripheral portion is formed in an annular convex arc-shaped surface and is driven to rotate around a grindstone rotation axis;
An outer peripheral portion is formed in an annular concave arc-shaped surface and is driven to rotate around a truer rotation axis parallel to the grindstone rotation axis. Forming the grindstone by transferring it to the part,
Moving means capable of moving the grindstone relative to the total type truer;
Control means for controlling the moving means;
A contact detecting means capable of detecting contact between the grindstone and the total type truer, and a grinding machine comprising:
Each of the surfaces adjacent to the concave arc-shaped surface of the total-type truer in the direction of the true axis of rotation is a conical surface having an apex angle of a predetermined angle on the concave arc-shaped surface side. Formed on the surface and the second detection surface,
Using the method for forming a grindstone according to any one of claims 1 to 4, the outer peripheral portion of the grindstone is shaped.
Grinder.

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