JP2010274406A - Method for measuring surface roughness of rotor, method for measuring projection amount of abrasive grain in grinding wheel, and grinding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for measuring a projection amount of abrasive grains in a grinding wheel, more easily measuring the projection amount of the abrasive grains of the grinding wheel without grinding a workpiece, and also to provide a grinding machine performing dressing at appropriate timing, based on the projection amount of the obtained abrasive grains, and a method for measuring the surface roughness of a rotor more easily without being limited by the projection amount of the abrasive grains of the grinding wheel. <P>SOLUTION: A driving force detection means DS measuring the driving force rotatively driving the rotor is used, fluid is poured to the surface of the rotatively driven rotor, and the surface roughness of the rotor is obtained based on the difference of the driving force detected by using the driving force detection means in the case where the fluid is poured and in the case where the fluid is not poured, or on the driving force detected by using the driving force detection means in the case where the fluid is poured. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for measuring surface roughness due to fine irregularities on the surface of a rotating body, a method for measuring the amount of protrusion of abrasive grains on a grindstone, and a grinding machine.

Conventionally, a grinding machine that grinds a workpiece by bringing a grindstone that is rotationally driven into contact with the workpiece is known. As shown in FIG. 2 (A), the grindstone T has a structure in which fine abrasive grains Tr are mixed in a base portion Tb made of a binder or the like and protrudes from the surface of the base portion Tb. Grinding is performed with the grains Tr.
The grinding performance of the grindstone T largely depends on the protrusion amount Ha of the abrasive grains Tr shown in FIG. 2A, and the grinding performance deteriorates when the abrasive grains Tr wear and the protrusion amount Ha decreases. The surface of the base portion Tb is removed without performing dressing periodically to remove the abrasive grains Tr, and the protruding amount Ha of the abrasive grains Tr is initialized.
In this specification, removing the surface of the base portion Tb to increase (initialize) the protruding amount Ha of the abrasive grains Tr is described as “dressing”, but the so-called contour shape of the grindstone T is adjusted. Truing is also included in “dressing”.
When the abrasive grains Tr are worn and the protruding amount Ha is reduced and the grinding performance is lowered, the processing time is prolonged and the processing accuracy is affected. Therefore, it is necessary to perform dressing at an appropriate time. However, the protrusion amount Ha of the abrasive grains Tr is, for example, about several tens [μm], and it is very difficult to directly measure, and the determination of the dressing time is very difficult.
Therefore, conventionally, based on the past processing results, the dressing time is determined from the specifications of the grindstone and the amount of the processed workpiece, the operator confirms the actual grinding state and determines the dressing time, The surface of the grinding wheel T is measured outside the machine (with the grinding wheel T removed) to determine the dressing time.
Moreover, in the prior art described in Patent Document 1, for example, a sensor that detects a drive current of a motor that drives a grindstone is provided, and the motor load is detected by detecting the current of the motor when a workpiece is ground with the grindstone. A dressing device for a grinding machine that detects and determines the dressing time is disclosed.

JP-A-5-77160

In the conventional method of determining the dressing time by confirming the past machining results and the grinding state by the operator, the dressing time is determined so as to be relatively early in order to have a large error and allow a margin. This is not preferable because it increases the number of interruptions and shortens the life of the grindstone.
Further, the method of measuring the surface of the grindstone T outside the machine is not preferable because it takes time and time for measurement, and the processing interruption time becomes long.
Moreover, in the prior art described in Patent Document 1, an actual workpiece must actually be ground using a grindstone.
The present invention was devised in view of such points, and the amount of protrusion of abrasive grains in the grindstone that can more easily measure the amount of protrusion of abrasive grains of the grindstone without grinding the workpiece. And a grinding machine capable of performing dressing at an appropriate time based on the determined protruding amount of abrasive grains, and moreover, it is not limited to the protruding amount of abrasive grains of the grindstone, and more easily the surface of the rotating body It is an object of the present invention to provide a method for measuring roughness.

As means for solving the above-mentioned problems, the first invention of the present invention is a method for measuring the surface roughness of a rotating body as described in claim 1.
The method for measuring the surface roughness of a rotating body according to claim 1 uses a driving force detecting means capable of detecting a driving force for rotationally driving the rotating body, and a control means, and the control means rotates the driving force. The liquid is poured onto the surface of the rotating body, the difference between the driving force detected by using the driving force detecting means when the liquid is poured and when the liquid is not poured, or when the liquid is poured It is a measuring method of the surface roughness of a rotating body which has a step which calculates | requires the surface roughness of the said rotating body based on the driving force detected using the driving force detection means.

The second invention of the present invention is a method for measuring the surface roughness of a rotating body as described in claim 2.
The method for measuring the surface roughness of the rotating body according to claim 2 is the method for measuring the surface roughness of the rotating body according to claim 1, wherein the driving force detecting means rotationally drives the rotating body. At least one of the power or current of the drive motor can be detected, and at least one of the power and current in the case where the liquid is poured and the case where the liquid is not poured corresponding to the surface roughness in advance in the storage means. A surface roughness-driving force characteristic obtained by measuring a difference or at least one of electric power and current when the liquid is poured is stored.
Then, the control means uses the driving force detection means to measure at least one of the electric power or current of the driving motor when the liquid is poured into the rotating body and when the liquid is not poured. Or measuring when pouring the liquid into the rotating body, a difference between at least one of measured power or current, or at least one of measured power or current, and surface roughness-drive Determining the surface roughness of the rotating body based on force characteristics, and measuring the surface roughness of the rotating body.

A third invention of the present invention is a method for measuring an amount of protrusion of abrasive grains in a grindstone as described in claim 3.
The method for measuring the protrusion amount of the abrasive grains in the grindstone according to claim 3 uses a driving force detecting means capable of detecting a driving force for rotationally driving the grindstone, and a control means, and projects onto the surface of the grindstone. A method for measuring the amount of abrasive grain protruding in a grindstone for measuring the amount of abrasive grain protruding, wherein the control means pours liquid onto the surface of the grindstone that is rotationally driven, and pours the liquid. Based on the difference in driving force detected using the driving force detection means when not pouring or the driving force detected using the driving force detection means when pouring the liquid, It is a measuring method of the protrusion amount of the abrasive grain in a grindstone which has the step which calculates | requires the protrusion amount of the surface abrasive grain.

A fourth invention of the present invention is a method for measuring an amount of protrusion of abrasive grains in a grindstone as described in claim 4.
The method for measuring the protruding amount of abrasive grains in the grindstone according to claim 4 is the measuring method of the protruding amount of abrasive grains in the grindstone according to claim 3, wherein the liquid is a coolant, and the driving force detection The means is capable of detecting at least one of electric power or current of a driving motor that rotationally drives the grindstone, and is not poured when the coolant is poured into the storage means in advance corresponding to the protruding amount of the abrasive grains. A protrusion amount-driving force characteristic obtained by measuring a difference between at least one of the power and the current and the power or at least one when the coolant is poured is stored.
Then, the control means uses the driving force detection means to measure at least one of the electric power or current of the driving motor in each of the case where the coolant is poured into the grindstone and the case where the coolant is not poured. Or measuring when the coolant is poured into the grindstone, a difference between at least one of the measured power or current, or at least one of the measured power or current, and the protrusion amount-driving force characteristic And determining the protrusion amount of abrasive grains on the surface of the grindstone based on the above, and a method for measuring the protrusion amount of abrasive grains in the grindstone.

The fifth invention of the present invention is a grinding machine as set forth in claim 5.
The grinding machine according to claim 5 is a grindstone that is rotationally driven, a driving force detecting means that can detect at least one of electric power or current of a driving motor that rotationally drives the grindstone, and a dressing means that can dress the grindstone. And a control means.
The control means preliminarily corresponds to the protrusion amount of the abrasive grains of the grindstone, and the difference between at least one of electric power and current when the coolant is poured into the grindstone and when the coolant is not poured, or the coolant is the grindstone. The protrusion amount-driving force characteristic obtained by measuring at least one of the electric power and the current in the case where the electric power is poured is stored.
Then, the control means uses the driving force detection means to measure at least one of electric power or current of the driving motor in each of the case where the coolant is poured into the grindstone and the case where the coolant is not poured. Alternatively, measured when the coolant is poured into the grindstone, and based on the difference between at least one of the measured power or current, or at least one of the measured power or current, and the protrusion amount-driving force characteristic The protrusion amount of the abrasive grains on the surface of the grindstone is obtained, and when the obtained protrusion amount of the abrasive grains is equal to or less than the predetermined protrusion amount, the grindstone is dressed using the dressing means.

  If the measuring method of the surface roughness of the rotating body according to claim 1 is used, the surface roughness can be measured more easily without damaging the surface of the rotating body.

  According to the method for measuring the surface roughness of the rotating body according to claim 2, it is possible to relatively easily realize the method for measuring the surface roughness of the rotating body without damaging the surface of the rotating body. it can.

  Further, according to the method for measuring the protruding amount of abrasive grains in the grindstone according to claim 3, without actually grinding the workpiece or measuring the protruding amount of the abrasive grains directly with a highly accurate shape measuring device, The protruding amount of abrasive grains in the grindstone can be measured more easily.

  Further, according to the method for measuring the amount of protrusion of abrasive grains in the grindstone according to claim 4, without actually grinding the workpiece or measuring the amount of protrusion of abrasive grains directly with a highly accurate shape measuring device, A method for measuring the protruding amount of abrasive grains on the grindstone can be realized relatively easily. Further, any driving force detecting means for detecting at least one of the electric power or current of the driving motor can be easily mounted on a grinding machine equipped with a grindstone.

  Further, according to the grinding machine of claim 5, since the dressing of the grindstone can be performed with an appropriate dressing amount at an appropriate time without being too late and not too early, the processing efficiency is reduced and the grindstone life is shortened. It is possible to realize a grinding machine that can appropriately suppress the decrease in the consumption of dress stones and the dressing time.

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 protrusion amount Ha of the abrasive grain Tr in the grindstone T. 5 is a diagram for explaining a method for measuring the protrusion amount Ha of abrasive grains Tr on a grindstone T. FIG.

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 cuts into the workpiece W.

● [Overall configuration of grinding machine 1 (FIGS. 1A, 1B)]
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 driving motor MT is provided with driving force detecting means DS capable of detecting electric power as driving force.
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.
The grindstone T is accommodated in a substantially box-shaped grindstone cover 12 having at least a part opened.

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 CN that supplies coolant in the vicinity of the grinding wheel grinding point TP.
In the grinding machine 1 shown in the examples of FIGS. 1A and 1B, the dressing means TR for dressing the grindstone T is attached to the spindle housing (left) HL.

● [Protrusion amount Ha of the abrasive grains Tr on the grinding wheel T (FIG. 2A)]
The grindstone T has a configuration in which a cylindrical grindstone member in which high-hardness abrasive grains Tr are mixed is attached to a base portion Tb made of a binder or the like, for example, on a metal disc-shaped base base. And as shown to FIG. 2 (A), grinding is performed by the abrasive grain Tr which protrudes from the surface of the base part Tb.
The grinding performance of the grindstone T is greatly influenced by the protrusion amount Ha of the abrasive grains Tr. As the wear of the abrasive grains Tr progresses and the protrusion amount Ha decreases (see FIG. 2C), the grinding performance decreases. It is necessary to remove the surface of the base portion Tb without cutting the abrasive grains Tr and increase (initialize) the protruding amount Ha.

To determine the timing of dressing of the grindstone T, the protrusion amount Ha of the abrasive grains Tr may be measured, but the protrusion amount Ha is about several tens [μm] and the protrusion is attached to the grinding machine 1. It is very difficult to accurately measure the quantity Ha.
Therefore, conventionally, dressing is performed every time n workpieces are processed based on past processing results, or the dressing time is determined from the processing state of the workpiece by a skilled worker.
However, this method is not preferable because the error is large and the dressing is performed relatively early in order to provide a margin, which increases the number of processing interruptions and decreases the life of the grinding wheel.
Moreover, the method of measuring the current of the grindstone drive motor described in Japanese Patent Application Laid-Open No. 5-77160 requires grinding an actual workpiece.
In the method for measuring the protrusion amount Ha of the abrasive grains Tr in the grindstone T described in the present embodiment, the protrusion amount Ha can be measured without grinding the actual workpiece (without wearing the grindstone T).

[Measurement method of protrusion amount Ha of abrasive grains Tr on the grindstone T (FIGS. 2B, 3C, 3A to 3C)]
For example, FIG. 2 (B) and FIG. 2 (C) show examples in which other conditions (the diameter of the grindstone T, the rotational speed, etc.) of the protrusion amount Ha are the same. In this case, the protrusion amount Ha is small. In FIG. 2 (B) where the protruding amount Ha is larger than 2 (C), the drag, which is the force opposite to the rotation direction, due to the fluid on the surface of the grindstone T becomes larger (Fa> Fb). Further, when a liquid (in this case, a coolant) is poured on the surface of the grindstone T, the drag is further increased, and the driving force of the grindstone drive motor MT is increased to maintain the grindstone T at a constant rotational speed. .
Therefore, even if the actual workpiece is not ground with the grindstone T, it is possible to obtain the protrusion amount Ha by measuring this driving force.
The driving force of the grindstone drive motor MT can be obtained by measuring the power or current of the grindstone drive motor MT.
Hereinafter, “a method for measuring the protrusion amount using the difference in driving force” and “a method for measuring the protrusion amount using the driving force” will be described.

[Method of measuring the amount of protrusion using the difference in driving force]
Next, a procedure for measuring the protrusion amount using “the difference in driving force” will be described.
A conversion table or a graph showing the relationship between the protrusion amount Ha and the power of the grindstone drive motor MT with respect to the grinding wheel specifications (type of abrasive grains, diameter of the wheel, etc.) in advance (see FIG. 3C. Protrusion amount-driving force characteristics). Equivalent). Using the driving force detection means DS, the coolant is poured onto the grindstone T with respect to various protrusion amounts Ha (in this case, the protrusion amount Ha can be measured using various measuring devices such as a laser measuring device). Measure the difference between the power when it is normal and the power when it is not poured.
For example, Fig. 3 (B) shows the case where the grinding wheel T is maintained at a constant rotation speed (eg, 3000 rpm) and the coolant is turned off (no pour)-> coolant is turned on (poured)-> the coolant is turned off (no pour). The solid line shows the measurement result of the driving force (electric power) when the protrusion amount Ha is large (protrusion amount = Ha1), and the dotted line shows the case where the protrusion amount Ha is small The measurement result of the driving force (power) of (projection amount = Ha2) is shown. In this case, the difference in power is ΔFa1 when the protrusion amount = Ha1, and the difference in power is ΔFa2 when the protrusion amount = Ha2.
And the difference of the electric power with respect to various protrusion amount is measured, the graph, the conversion table, etc. which are shown in FIG.3 (C) are created, and the "projection amount-driving force characteristic" which is the created graph and the conversion table is used for the grinding machine 1. Is stored in the control means (corresponding to storage means). Here, in the “protrusion amount-driving force characteristic” shown in FIG. 3C, when the protrusion amount is equal to or smaller than Hmin (corresponding to a predetermined protrusion amount) (or when the driving force difference is equal to or smaller than ΔFmin), dressing of the grindstone T is performed. Is necessary.

As shown in FIGS. 1A and 1B, the grinding machine 1 is provided with a driving force detection means DS and a coolant nozzle CN.
The control means starts measuring the protruding amount of the abrasive grains Tr at a predetermined timing (for example, every time m workpieces are processed).
In the first step, the control means rotates the grindstone T and measures power using the driving force detection means DS, while discharging or stopping the coolant from the coolant nozzle CN, and measures the difference in power.
In the next step, the control means obtains the protrusion amount of the abrasive grains based on the measured difference in power and the protrusion amount-driving force characteristic.
In the next step, the control means determines that dressing is not particularly necessary if the obtained protrusion amount is larger than Hmin, and determines that dressing is necessary if the obtained protrusion amount is equal to or less than Hmin. The grindstone T is moved relative to TR to dress the grindstone T, and the protrusion amount Ha of the abrasive grains Tr is initialized.

[Method of measuring the amount of protrusion using the driving force]
Next, a procedure for measuring the protrusion amount using “driving force” will be described.
Similar to the above, the protrusion amount-driving force characteristic is created in advance, but the power when coolant is poured into the grindstone T is measured, and the power when not poured is not measured.
For example, Fig. 3 (B) shows the case where the grinding wheel T is maintained at a constant rotation speed (eg, 3000 rpm) and the coolant is turned off (no pour)-> coolant is turned on (poured)-> the coolant is turned off (no pour). The solid line shows the measurement result of the driving force (electric power) when the protrusion amount Ha is large (protrusion amount = Ha1), and the dotted line shows the case where the protrusion amount Ha is small The measurement result of the driving force (power) of (projection amount = Ha2) is shown. In this case, the electric power is Fa1 when the protrusion amount = Ha1, and the electric power is Fa2 when the protrusion amount = Ha2.
And the electric power with respect to various protrusion amount is measured, a graph, a conversion table, etc. are created, and the control means (equivalent to memory | storage means) of the grinding machine 1 is made into the produced graph and the conversion table "protrusion amount-driving force characteristic". Remember it. Here, in the “protrusion amount-driving force characteristic”, it is assumed that dressing of the grindstone T is necessary when the protrusion amount is equal to or less than Hmin (corresponding to a predetermined protrusion amount).

As shown in FIGS. 1A and 1B, the grinding machine 1 is provided with a driving force detection means DS and a coolant nozzle CN.
The control means starts measuring the protruding amount of the abrasive grains Tr at a predetermined timing (for example, every time m workpieces are processed).
In the first step, the control means measures the electric power by discharging the coolant from the coolant nozzle CN while measuring the electric power using the driving force detecting means DS by rotating the grindstone T.
In the next step, the control means obtains the protrusion amount of the abrasive grains based on the measured electric power and the protrusion amount-driving force characteristic.
In the next step, the control means determines that dressing is not particularly necessary if the obtained protrusion amount is larger than Hmin, and determines that dressing is necessary if the obtained protrusion amount is equal to or less than Hmin. The grindstone T is moved relative to TR to dress the grindstone T, and the protrusion amount Ha of the abrasive grains Tr is initialized.

In the above description, the electric power of the grindstone drive motor MT is used as the driving force of the grindstone T. However, the current of the grindstone drive motor MT may be used, and at least one of electric power or current can be used as the driving force.
As described above, if the method for measuring the protrusion amount Ha of the abrasive grains Tr in the grindstone T described in the present embodiment is used, the protrusion amount Ha can be measured more accurately on the machine without grinding the actual workpiece. It is possible to minimize the number of dressings of the grindstone T, and the number of processing interruptions can be reduced. Moreover, since the grindstone T can be used until just before the limit without producing defective products, the grindstone life can be extended.

[Application to surface roughness measurement of rotating bodies]
Further, the present invention is not limited to the protrusion amount Ha of the abrasive grains Tr in the grindstone T, and can also be applied to a method for measuring the surface roughness of the rotating body. In this case, a graph of “surface roughness-driving force characteristics” or the like corresponding to the surface roughness of the rotating body is created in advance, and the liquid is poured or not poured onto the surface of the rotating body to be measured. Measure the difference in driving force (difference between at least one of electric power and current) and measure the surface roughness of the rotating body based on the measured driving force difference and the “surface roughness-driving force characteristics”. Can do. In this case, the surface roughness can be measured without damaging the surface of the rotating body.
In addition, without using the difference between the driving force when the liquid is poured into the rotating body and the driving force when the liquid is not poured, as described above, using the driving force when the liquid is poured into the rotating body, It is also possible to measure the surface roughness of the rotating body.

  As described above, in the description of the present embodiment, how much surface is obtained from the difference (or driving force) of the driving force measured using the protrusion amount (surface roughness) -driving force characteristic (see FIG. 3C). Although an example in which the roughness (in this case, how long the protruding amount is) has been described, the predetermined protruding amount (predetermined surface roughness) is used without using the protruding amount (surface roughness) -driving force characteristic. It is also possible to obtain only whether or not it is above. In this case, a driving force difference (or driving force) that becomes a predetermined protrusion amount (predetermined surface roughness) is measured and stored in advance, and the measured driving force difference (or driving force) is equal to or greater than a driving force threshold. Or not. For example, with respect to the protrusion amount of the abrasive grains Tr on the grindstone T, the driving force difference (or driving force) in that state where the dressing amount of the grindstone T is not required is minimized and stored in advance as a driving force threshold value. Keep it. When the measured driving force difference (or driving force) is less than the driving force threshold, it is possible to determine that the protrusion amount (surface roughness) is less than the predetermined protrusion amount (less than the predetermined surface roughness). In that case, dressing of the grindstone T may be executed. This driving force threshold is also an example of the protrusion amount (surface roughness) -driving force characteristic.

The method for measuring the protruding amount of abrasive grains, the dressing method for the grindstone, and the method for measuring the surface roughness of the rotating body in the grindstone of the present invention are not limited to the processing, method, etc. described in the present embodiment. Various changes, additions and deletions can be made without changing the gist.
The positions where the driving force detection means DS and the dressing means TR are provided are not limited to the positions shown in FIGS. 1A and 1B, and may be provided anywhere on the grinding machine 1.

DESCRIPTION OF SYMBOLS 1 Grinding machine 12 Wheel cover 25 Axis holder 40 Wheel slide table 41 Wheel advance / retreat table BS Base CL, CR Center member CN Coolant nozzle DS Driving force detection means Ha Extrusion amount MT Wheel driving motor MX Z axis driving motor MZ X axis driving motor GX, GZ Guide SL, SR Spindle (left), Spindle (right)
T Grinding wheel Tb Base part TP Grinding point TR Dressing means Tr Abrasive grain TZ Grinding wheel rotation axis W Work WZ Work rotation axis

Claims (5)

Using a driving force detection means capable of detecting a driving force for rotationally driving the rotating body, and a control means,
In the control means,
When a liquid is poured onto the surface of a rotating body that is rotationally driven, the difference in driving force detected using the driving force detecting means between when the liquid is poured and when the liquid is not poured, or when the liquid is poured Obtaining the surface roughness of the rotating body based on the driving force detected using the driving force detecting means in
Measuring method of surface roughness of rotating body. It is a measuring method of the surface roughness of the rotary body according to claim 1,
The driving force detecting means can detect at least one of electric power or current of a driving motor that rotationally drives the rotating body,
In correspondence with the surface roughness, the difference between at least one of power and current when the liquid is poured and when not poured, or the power or current when the liquid is poured, is stored in the storage means in advance. Store at least one of the measured surface roughness-driving force characteristics,
In the control means,
Using the driving force detecting means, at least one of the electric power or current of the driving motor is measured when the liquid is poured into the rotating body and when the liquid is not poured, or the liquid is Measuring when pouring on a rotating body, steps,
Determining the surface roughness of the rotating body based on the difference between at least one of the measured power or current, or at least one of the measured power or current, and the surface roughness-driving force characteristic. ,
Measuring method of surface roughness of rotating body. Using a driving force detection means capable of detecting a driving force for rotationally driving the grindstone, and a control means, the amount of protrusion of the abrasive grains protruding from the surface of the grindstone is measured. A method,
In the control means,
When a liquid is poured on the surface of the grindstone that is rotationally driven, the difference in driving force detected using the driving force detecting means between when the liquid is poured and when the liquid is not poured, or when the liquid is poured Based on the driving force detected using the driving force detecting means in the step of determining the protrusion amount of the abrasive grains on the surface of the grindstone,
A method for measuring the protruding amount of abrasive grains in a grindstone. It is a measuring method of the protrusion amount of the abrasive grain in the whetstone according to claim 3,
The liquid is a coolant;
The driving force detection means can detect at least one of electric power or current of a driving motor that rotationally drives the grindstone,
In correspondence with the amount of protrusion of abrasive grains in the storage means, the difference between at least one of power and current when the coolant is poured and when not poured, or power or current when the coolant is poured Memorize the protrusion amount-driving force characteristic measured at least one of
In the control means,
Using the driving force detecting means, at least one of the electric power or current of the driving motor is measured when the coolant is poured into the grindstone and when the coolant is not poured, or the coolant is measured with the grindstone. Measuring when you are pouring into, steps,
Determining a protrusion amount of abrasive grains on the surface of the grindstone based on a difference between at least one of measured power or current, or at least one of measured power or current, and the protrusion amount-driving force characteristic; Having
A method for measuring the protruding amount of abrasive grains in a grindstone. A grindstone that is driven to rotate;
Driving force detection means capable of detecting at least one of electric power or current of a driving motor that rotationally drives the grindstone;
Dressing means capable of dressing the grinding wheel;
A grinding machine comprising control means,
The control means preliminarily corresponds to the protrusion amount of the abrasive grains of the grindstone, and the difference between at least one of electric power and current when the coolant is poured into the grindstone and when the coolant is not poured, or the coolant is the grindstone. The protrusion amount-driving force characteristic obtained by measuring at least one of the electric power and the current in the case of pouring in is stored.
The control means includes
Using the driving force detecting means, at least one of the electric power or current of the driving motor is measured when the coolant is poured into the grindstone and when the coolant is not poured, or the coolant is fed into the grindstone. Measure if you are pouring into
Based on the difference between at least one of the measured power or current, or at least one of the measured power or current, and the protrusion amount-driving force characteristic, the protrusion amount of the abrasive grains on the surface of the grindstone is determined.
When the amount of protrusion of the determined abrasive is equal to or less than the predetermined protrusion amount, dressing the grindstone using the dressing means,
Grinder.

Images