JPH07299699A - Grinding method and its device - Google Patents

Abstract

PURPOSE:To facilitate highly accurate grinding by drawing up a correction program when the depth of cut is judged to be insufficient in the case where a difference more than a fixed allowable error exists between measured value and set up value, and grinding a workpiece on the above correction program. CONSTITUTION:A NC device 27 is controlled for carrying out the axial movement of a measuring device 33 and a table 17 and moreover the shape measurement of a work W. A positional relationship between the tip part and shank reference plane K of the work W is measured to avoid defective assembly being due to a relationship error between the tip part and the shank reference plane K. In addition, the measuring device 33 measures the work W on the basis of a NC program, and in the case where a discrepancy exists in the result of measurement, and its correction is required, a correction program is automatically drawn up. Grinding is carried out according to the above correction program. Thus since the highly accurate grinding becomes practicable, and the result of grinding process is automatically measured and judged, an error being due to a worker and a personal difference can be removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding method and an apparatus thereof, and more particularly to a grinding method and an apparatus thereof capable of measuring a shape of a work.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Publication No. 2-1 has been used as a grinding apparatus for performing grinding while measuring the shape of a work.
The optical profile grinding apparatus disclosed in Japanese Patent Laid-Open No. 630 or Japanese Patent Laid-Open No. 250760/1990 is known. This optical copying grinding device grinds a work into the same shape as the part to be ground of the work displayed on the screen.

That is, as shown in FIG. 13, a chart diagram of a target shape 103 and an actual processed shape 105 are shown on a screen 101, and a comparative measurement is performed to show a shaded portion in the drawing of FIG. It is general to judge by the operator and finish additional grinding.

[0004]

However, in such a conventional optical profile grinding apparatus, a chart diagram of the target shape 103 projected by the operator on the screen 101 and the actual processed shape 105 are shown. Since the difference is judged, a human error occurs.

Further, the optical resolution of the projector itself is at most 2 to 3 μm, and in addition, the accuracy varies depending on the position on the screen 101 due to the distortion aberration, which makes precise measurement extremely difficult. There is a problem that is.

Further, as shown in FIGS. 14 and 15, for example, in the precision progressive die punch 107, pitches P1 and P2 are combined as indicated by pitches P1 and P2 in the drawing of FIG. This is the attachment reference, and the shank reference surface K of the die punch 107 shown in FIG. 15 is the reference.

However, even though the assembling accuracy standard of the die punch 107 is normally two surfaces perpendicular to the shank reference plane K, only the cutting edge shape is measured in the processing by the conventional optical copying grinding apparatus. For this reason, a precision progressive die punch 1
In the case where the shape of the cutting edge from the shank reference surface K is important, such as 07, no matter how accurately the cutting edge shape can be machined, it is defective at the time of assembly due to an error from the shank reference surface K which is the assembly accuracy reference surface. In some cases,

The object of the present invention has been made by paying attention to the conventional technique as described above, and it is possible to measure a work with high accuracy and perform automatic machining by automatic programming to correct a machining error. It is to provide a grinding method and an apparatus therefor.

[0009]

In order to achieve the above object, the grinding method of the invention according to claim 1 grinds a workpiece based on an NC program, and then based on a measurement program. The reference surface of the shank on the work is measured by the relative movement of the measuring device and the work, and the shape of the cutting edge of the work is measured, and then the measured reference surface of the shank and the actual shape of the cutting edge are measured. The value and the preset standard setting value of the shank and the finish machining shape setting value of the cutting edge are compared and judged, and as a result of the comparison judgment, there must be a difference of a predetermined allowable error or more between the measured value and the set value. For example, when the machining is completed and when it is judged that the cutting depth is insufficient when there is a difference exceeding the allowable error, a correction program is created and based on this correction program. More work iterator is characterized in that to perform grinding.

In order to achieve the above-mentioned object, the grinding method of the invention according to claim 2 is a general formula in which the comparative judgment in claim 1 expresses the straight line or curve from the measured value for each element of the straight line or curve. The coefficient of the general formula expressing the straight line or curve is calculated from the finish machining shape setting value, and then the coefficient for the measured value and the coefficient for the setting value are compared for each element and are within the specified tolerance. It is characterized by determining whether or not.

In order to achieve the above-mentioned object, the grinding method of the present invention according to claim 3 obtains the coefficient of the general formula representing the straight line or curve from the measured value for each element of the straight line or curve in claim 2. At that time, the feature is that the measured values are matched based on the continuity between the respective elements.

In order to achieve the above-mentioned object, the grinding apparatus of the invention according to claim 4 grinds a workpiece mounted and fixed on a table by a grindstone which is movable in the front-rear, left-right and up-down directions. A measuring device provided as a grinding processing device for measuring a shank reference surface and a cutting edge shape of a work, a moving means for relatively moving the work with respect to the measuring device, and the measuring device and the moving means. Controlling and comparing the measured value of the shank reference surface and the cutting edge shape in the work measured by the measuring device with a preset setting value, and processing if there is no difference between the measurement value and the setting value that is equal to or more than the allowable error. However, if there is a difference greater than the allowable error, a control device for performing correction processing is provided.

In order to achieve the above object, in the grinding apparatus of the invention according to claim 5, the moving means in claim 4 mounts and fixes the workpiece on the measuring device fixed to the grinding apparatus. It is characterized in that it is configured to move the table back and forth, left and right, and up and down.

In order to achieve the above-mentioned object, in the grinding apparatus of the invention according to claim 6, the moving means according to claim 4 is arranged so that the work is placed and fixed to the table fixed to the grinding apparatus. It is characterized in that it is configured to move the measuring device in the front-back, left-right and up-down directions.

The grinding apparatus of the invention according to claim 7 is characterized in that the measuring device according to claim 4 is a touch sensor.

[0016]

In the grinding method according to the first aspect, first, NC
After grinding the workpiece based on the program,
Based on the measurement program, the reference surface of the shank of the work is measured by the relative movement of the measuring device and the work, and the shape of the cutting edge of the work is measured. Thereafter, the measured reference surface measurement value of the actual shank and the actual shape measurement value of the cutting edge are compared with the preset reference setting value of the shank and finishing machining shape setting value of the cutting edge, respectively. As a result of the comparison and judgment, if there is no difference between the measured value and the set value that is equal to or greater than a predetermined allowable error, the machining is terminated, and if there is a difference that is equal to or greater than the allowable error, it is determined that the correction program is insufficient. Is created, and the work is further ground based on this correction program.

In the grinding method according to the second aspect, in the comparative judgment according to the first aspect, the coefficient of the general formula representing the straight line or the curve is first obtained from the measured value for each element of the straight line or the curve. Similarly, the coefficient of the general formula representing the straight line or curve is obtained from the finish processing shape set value. After that, the coefficient for the measured value and the coefficient for the set value are compared for each element to determine whether or not the coefficient is within a predetermined allowable error.

Further, in the grinding method according to claim 3, in obtaining the coefficient of the general formula representing the straight line or curve from the measured value for each element of the straight line or curve in claim 2, the continuity between the respective elements is determined. To match the measured values.

In the grinding apparatus according to the fourth aspect, a grindstone that is movable in the front-rear direction, the left-right direction, and the up-and-down direction and is rotatable performs the grinding process on the workpiece mounted and fixed on the table. Then, the measuring device measures the shank reference surface and the cutting edge shape of the work while the moving means moves the ground work relatively to the measuring device. At this time, the measuring device and the moving means are controlled by the control device, and the control device compares the measured values of the shank reference surface and the cutting edge shape in the work measured by the measuring device with the preset setting values. If the difference between the measured value and the set value does not exceed the permissible error, the machining is terminated, but if there is the difference within the permissible error, the correction machining is controlled.

According to the grinding apparatus of claim 5, the grinding device of claim 4 is used.
The moving means in the front and rear of the table on which the work is placed and fixed with respect to the measuring device fixed to the grinding processing device.
It is to move left and right and up and down.

According to the grinding processing apparatus of claim 6,
The moving means in (1) moves and moves the measuring device in the front-back, left-right and up-down directions with respect to the table on which the work is placed and fixed and which is fixed to the grinding processing device.

Further, in the grinding apparatus according to claim 7, since the measuring device according to claim 4 comprises a touch sensor, the measurement is performed by moving the touch sensor relative to the work. Is.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings. Although an optical copying grinding apparatus is used as the grinding processing apparatus, this optical copying grinding apparatus has a known structure, and detailed illustration and description thereof will be omitted.

Referring to FIG. 2, the optical profile grinding apparatus 1 is
A base 5 is provided on the upper left side of the machine base 3 in FIG. 2, and a Y-axis slider 7 that is movable in the Y-axis direction (left-right direction in FIG. 2) is provided on the base 5. An X-axis slider 9 which is movable in the X-axis direction (direction orthogonal to the paper surface in FIG. 2) is provided on the shaft slider 7. The X-axis slider 9 and the Y-axis slider 7 are movable in the X-axis and Y-axis directions by driving means such as a servo motor (not shown).

On the X-axis slider 9, there is provided a swivel base 11 which is rotatable about a swivel center extending in the vertical direction, and a grindstone head 13 is provided on the swivel base 11. Therefore, the grindstone head 13 rotates integrally with the swivel base 11. Further, a rotatable grindstone 15 is provided on the right side of the grindstone head 13 in FIG.

A table 17 for supporting the work W is provided at a position facing the grindstone 15 on the right side of the upper surface of the machine base 3, and the table 17 is provided on the lower side of the U-axis moving base 19. It is movable in the U-axis direction (direction orthogonal to the paper surface in FIG. 2) along the guide surface.

Below the U-axis moving table 19, there is provided a V-axis moving table 21 which is movable in the V-axis direction (left and right direction in FIG. 2). The V-axis moving table 21 is movable in the W-axis direction (vertical direction in FIG. 2), and the U-axis, V-axis, and W-axis are moved by a driving means such as a servo motor, which is not shown.

With the above configuration, the work W is placed on the table 17
X-axis, while being mounted on the X-axis, positioned in the U-axis, V-axis, and W-axis directions and rotating the grindstone 15 at a predetermined rotation speed.
By moving the axis, Y-axis direction and turning direction,
The work W is to be ground.

Above the grinding surface of the grindstone 15 and the work W,
A projector for projecting the grinding surface is provided, and the grindstone 15 and the work W are projected on the image screen 25 mounted on the frame 23 standing on the machine base 3. The projection magnification can be selected in several steps. Further, an NC device 27 is provided adjacent to the video screen 25, and an arithmetic device 31 is connected to the NC device 27 by a communication line 29.

Further, the frame 2 is provided above the work W.
A measuring device 33 is provided depending from 3. More specifically, as shown in FIG. 3, the measuring device 33 is, for example, a limit switch 37 provided with a contact 35, and the limit switch 37 is vertically moved by a motor (not shown) or a fluid pressure operated cylinder or the like on the support body 39. It is designed to be retracted in the direction. The support 39 is mounted on the frame 23 that constitutes the optical copying and grinding apparatus 1. The contact 3 provided in the limit switch 37
The lower limit position of 5 is adjustable.

FIG. 4 shows a block diagram of the configuration of a control device for controlling the optical copying grinding device 1. In FIG.
Via the communication interface 27A on the NC device 27 side and the communication interface 31A on the arithmetic device 31 side,
The NC program and the measured coordinate values are sent from the NC device 27 to the computing device 31, and the shape of the work W is sent from the CAD 41 to the computing device 31 via the data communication interface 31A. The arithmetic unit 31 has a function of creating a measurement program and confirming the measurement result, and performing automatic programming of the correction amount when the measurement result is recognized as defective.

On the other hand, the measurement program and the correction program are transferred from the arithmetic unit 31 to the NC unit 27 via the communication interface 31A on the arithmetic unit 31 side and the communication interface 27A on the NC unit 27 side.

An X-axis servo mechanism and a Y-axis servo mechanism 43 are connected to the NC device 27, and a movement command amount is distributed to each axis to distribute the X-axis servo mechanism and the Y-axis servo mechanism 43.
Is controlled, and a grinding process command is given by the grindstone 15.

Further, a U-axis and V-axis servomechanism 45 by a servomotor is connected to the NC device 27.
A movement command is issued to drive the axis and V-axis servo mechanism 45 to move the work W to the measurement point. Further, a W-axis servo mechanism 47 by a servo motor is connected to the NC device 27, drives the W-axis servo mechanism to vertically position the table 17, and issues a movement command to the blade edge of the work W and the shank portion. Be seen.

A measuring device 33 is connected to the NC device 27. The measuring device 33 measures the working portion (cutting edge, shank portion) of the workpiece W and outputs an output signal N.
Send to C device 27.

Next, the operation will be described with reference to the flow chart shown in FIG. The NC program is input to the NC device 27, and this NC program and CAD W work W
The shape data of the above is transferred to the arithmetic unit 31 (step SA
1). The arithmetic unit 31 creates a measurement program (step SA2), and transfers this measurement program to the NC device 27 (step SA3).

The NC device 27 includes an X-axis and Y-axis servo mechanism 43.
The workpiece W is ground by the rotating grindstone 15 (step SA4). After that, the U-axis and V-axis servomechanisms 45 are driven to move the work W to the measurement point, the W-axis servomechanisms 47 are driven to position the table 17 upward (step SA5), and the shank reference plane K of the work W is set.
(See FIG. 15) is measured by the measuring device 33 (step SA6).

Then, the table 17 is lowered and positioned (step SA7), and the shape of the cutting edge of the work W is measured by the measuring device 3.
The measurement is performed at 3 (step SA8). Then, each measured value is transferred to the arithmetic unit 31 (step SA9). Each measurement value transferred to the arithmetic unit 31 is determined by the arithmetic unit 31 as to a measurement result described later (step SA10). If the result of the determination is good, the process ends, but if it is determined to be defective, the process will be described later. Create a correction program to
11) and returns to step SA2. After that, the above steps are repeated until the determination result becomes good.

Next, according to the flow chart shown in FIG. 5, the determination process of the measurement result by the arithmetic unit 31 will be described with reference to FIGS.

Based on the NC program and the finish machining shape data from the CAD 41, the coefficient for each element is obtained (step SB1).

Here, the coefficient for each element will be described taking the finished shape as shown by the solid line in FIG. 6A as an example. As shown in FIG. 6B, the finish machining shape data representing such a finish shape includes elements, ...
For linear elements such as, start point coordinates, end point coordinates,
For arc elements such as elements, the start point coordinates, end point coordinates, midpoint coordinates, and radius are adopted.

Next, the straight line general formula a ₁ .X + b ₁ .Y +
c ₁ = 0 and the general formula of the circle X ² + Y ² −a ₂ · X + b ₂
When the coefficients a, b, and c of Y + c ₂ = 0 are obtained, the result shown in FIG.
As shown in (C). In the following description, the processed shape shown in FIG. 6 (A) will be used.

Next, returning to FIG. 5, the coefficient for each element is obtained from the measurement point data (step SB2).

Here, the points measured with respect to the machining shown in the elements in FIG.
It is indicated by a cross mark in (A). When these points are approximated by a straight line, they are given by the general formula ma ₁ · X + mb ₁ · Y + mc ₁ = 0, and when the vicinity of the intersection of straight lines is approximated by a circle, the general formula X
Represented by _{^{2 + Y 2 -ma 2 · X}} + mb 2 · Y + mc 2 = 0. When these coefficients ma, mb, and mc are calculated,
As shown in (B).

Subsequently, returning to FIG. 5, the measurement data is matched so that the two straight lines obtained from the measurement data and the circle are in contact with each other to form a continuous shape (step SB3).

That is, as indicated by the broken line in FIG. 8A, the measurement shapes represented by the two linear elements and the circular element are not continuous at the points marked with a circle.
Matching is performed as shown in FIG.
Here, as shown in FIG. 9, an example of the matching method will be described for the case of the straight line element and the circular element, but the same applies to the case of the straight line element and the circular element. A perpendicular line is drawn from the center P0 of the circle element to the straight line element, its foot is P1, and the intersection point of the perpendicular line and the circle element is P2. The circular element is moved to P3, which is the midpoint between P1 and P2 (see FIG. 9A). Then, in the same way as above,
The circular element is moved to P6, which is the midpoint of P4 and P5, and approaches a linear element (see FIG. 9B). As a result, the state shown in FIG.
The procedure shown in (A) and FIG. 9 (B) is repeated, and as shown in FIG. 9 (D), the circular element is in contact with the linear element and the alignment is performed.

Returning to FIG. 5, the measurement data thus aligned is output (step SB4), and the tolerance determination process is performed (step SB5).

Here, the tolerance determination process will be described with reference to FIG. The case shown in FIG. 10A will be described as an example. It is determined whether or not the deviation between the finished shape and the measured shape is within the tolerance near the intersection of the straight line element and. That is, as shown in FIG. 10 (B), it is determined that the deviation is within the allowable error only when the deviation is inside the tolerance band within the range of the element currently considered (FIG. 10 (B)). ) Range indicated by B). This is shown in FIG. 11 (A), and shown in a table in FIG. 11 (B). As a result, for example, the point P in FIG. 11 (C) hits Y · Y and the determination is Y, so it can be seen that the cutting is out of tolerance.

Returning to FIG. 5 again, the determination is performed (step SB6), and if it is determined that the cut is too large, error processing is performed (step SB7). If it is determined that the machining is performed within the tolerance, the machining is finished (step SB8). On the other hand, if it is determined that the depth of cut is insufficient, a correction program creating process is performed for further machining (step SB9).

Next, the procedure of the correction program creating process will be described with reference to the flow chart shown in FIG.

The machining error vector V (P1, P1 ') at each intersection is shown in FIG. 12 from the finish shape data and the measured shape data.
It is calculated as shown in (B) (step SC1).
From this processing error vector, the correction vector V (P1, P
1 ″) is obtained (step SC2). Since it is the correction of insufficient cutting, V (P1, P1 '') =-V (P1, P
1 '). Subsequently, intersection data of the correction shape is calculated from the finish shape data and the correction vector (step SC3), and as shown in FIG. 12C, an NC program for correction is created from the intersection data of the correction shape ( Step SC4). Note that G0 in FIG.
1 XrX1 YrY1; is the coordinates (rX1, rY1)
Is linearly interpolated, G02 XrX2 Y
rY2 RR2; is the radius R with coordinates (rX2, rY2)
The circle 2 indicates that circular interpolation processing is performed.

According to such a grinding method and its apparatus, since the NC device 27 is controlled to axially move the measuring device 33 and the table 17 and the shape of the work W is measured, the operator does not have to make a judgment. Therefore, the measurement error can be eliminated. Further, since the positional relationship between the cutting edge portion of the work W and the shank reference surface K can be measured, it is possible to avoid a defect during assembly due to a relational error between the cutting edge portion and the shank reference surface K.

Further, when the measuring device 33 measures the work W based on the NC program and correction is necessary when there is a deviation in the measurement result, the correction program is automatically created. Therefore, it is possible to eliminate the operator's work of programming the correction document. Further, since the grinding process is further performed according to this correction program, it is possible to perform the highly accurate grinding process.

Further, when the limit switch 37 having the contactor 35 is used as the measuring device 33, there is no limit of the optical resolution of the projector, so that there is no variation in accuracy and precise measurement can be performed. become.

Further, when performing the determination process of the measurement result, the arithmetic unit 31 matches the measurement values, finds a general formula for each element such as the linear element and the circular element of the machining shape, and uses the coefficient thereof. Since the judgment is made, the automatic and accurate judgment is objectively made.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. For example, in the above-described embodiment, the limit switch 37 including the contactor 35 is used as the measuring device 33, but a noncontactor sensor may be used.

Although the measuring device 33 is provided on the frame 23 of the grinding device 1, the measuring device 33 is used for the grindstone head 13.
Alternatively, the shape of the workpiece W may be measured by fixing the workpiece W on the side and moving the X axis and the Y axis.

Further, even if the measuring device 33 can be moved by a separate driving device, the same effect can be obtained.

Further, the case where only the linear element and the circular element are provided as the approximate expression of the machining shape in the determination processing has been described, but the present invention is not limited to this, and the same can be done by using a higher-order curve.

Furthermore, in the above-mentioned embodiment, the machining shape data is input by the NC program, but it may be input interactively from the input means or CAD data.

[0061]

The grinding method according to the first aspect of the present invention is as described above. After grinding the workpiece based on the NC program, the measuring device and the workpiece are measured based on the measuring program. Since the reference surface of the shank on the work is measured by the relative movement of the workpiece and the shape of the cutting edge of the work is measured, the positional relationship between the cutting edge of the work and the shank reference surface can be measured without attaching or detaching the work. It is possible to avoid defects when attaching. In addition, measurement by a touch sensor becomes possible. Thereafter, the measured reference surface measurement value of the actual shank and the actual shape measurement value of the cutting edge are compared and judged with the preset reference setting value of the shank and the finishing machining shape setting value of the cutting edge, respectively, and the result If there is no difference between the measured value and the set value that is greater than or equal to the predetermined allowable error, machining is ended, and if there is a difference that is greater than or equal to the allowable error, a correction program is created if Since the work is further ground based on the correction program, highly accurate grinding is possible. Further, since the measurement is automatically performed and the judgment is made, it is possible to eliminate the error due to the operator and the individual difference.

In the grinding method of the present invention according to claim 2, in the comparative judgment according to claim 1, first, the coefficient of the general formula representing the straight line or curve is obtained from the measured value for each element of the straight line or curve, and similarly. Then, the coefficient of the general formula representing the straight line or curve is obtained from the finish processing shape set value. After that, the coefficient for the measured value and the coefficient for the set value are compared for each element to determine whether or not they are within a predetermined allowable error, so that an objective and highly accurate determination can be automatically performed.

In the grinding method of the present invention according to claim 3, in determining the coefficient of the general formula representing the straight line or curve from the measured value for each element of the straight line or curve in claim 2, the continuity between the respective elements is determined. Since the measured values are matched based on the characteristics, an approximate straight line or an approximate curve can be accurately obtained, and an accurate determination can be made.

In the grinding apparatus of the present invention according to claim 4, a grindstone which is movable in the front-rear direction, left-right direction and up-down direction and rotatable grinds the work fixed on the table, and the moving means is used. Since the measuring device automatically measures this ground work while moving it relative to the measuring device, it does not bother the worker such as the removal and judgment of the work and the error caused by the worker. Can be measured. The measuring device and the moving means are controlled by the control device, and the control device measures the shank reference surface and the cutting edge shape of the work measured by the measuring device, so that the positional relationship between the cutting edge part of the work and the shank reference surface is measured. Can be measured and defects during assembly can be avoided. In addition, the measured values of the cutting edge of the workpiece and the shank reference surface are compared and judged, and if there is no difference greater than the allowable error, the machining ends, but if there is a difference greater than the allowable error, Since it is controlled to perform correction processing, highly accurate automatic grinding processing becomes possible.

In the grinding apparatus of the present invention according to claim 5, the moving means according to claim 4 causes the table on which the work is mounted and fixed to the measuring device fixed to the grinding apparatus to move forward and backward, left and right, and up and down. Since it is moved in the direction, highly accurate measurement by the touch sensor becomes possible.

In the grinding apparatus of the present invention according to claim 6, the moving means according to claim 4 mounts and fixes the work piece on the table fixed to the grinding apparatus.
Since the measuring device is moved back and forth, left and right, and up and down, highly accurate measurement by the touch sensor becomes possible.

In the grinding apparatus of the present invention according to claim 7, the measuring device according to claim 4 is composed of a touch sensor, and the touch sensor is moved relative to the workpiece to perform the measurement. Will be possible.

[Brief description of drawings]

FIG. 1 is a flowchart showing a grinding method according to the present invention.

FIG. 2 is a front view showing a grinding apparatus according to the present invention.

FIG. 3 is an enlarged explanatory view of a measuring device.

FIG. 4 is a block diagram showing a configuration of a control device.

FIG. 5 is a flowchart showing a procedure for determining a measurement result by the arithmetic unit.

FIG. 6 is a diagram and a table for explaining the coefficient of each element in the finish machining shape data.

FIG. 7 is a diagram and a table showing coefficients for each element obtained from measurement data.

FIG. 8 is an explanatory diagram showing matching of measurement data.

FIG. 9 is a diagram showing a procedure of matching measurement data.

FIG. 10 is a diagram showing details of a tolerance determination process.

11A and 11B are a diagram and a table showing a result of determination processing.

FIG. 12 is a flowchart and a chart showing a correction program creating process.

FIG. 13 is an explanatory diagram showing a state displayed on a screen in a conventional optical copying grinding apparatus.

FIG. 14 is an explanatory diagram showing an arrangement of conventional precision progressive die punches.

FIG. 15 is an explanatory view showing a shank reference surface and a shape of a cutting edge of a conventional work.

[Explanation of symbols]

 1 Grinding device 15 Grinding stone 17 Table 19 U-axis moving table (moving means) 21 V-axis moving table (moving means) 27 NC device (control device) 33 Measuring device 37 Limit switch (touch sensor) W Work K Reference surface of shank

Claims (7)

[Claims] 1. A grinding surface of a workpiece based on an NC program, and then a reference surface of a shank on the workpiece is measured by relative movement of the measuring device and the workpiece based on the measuring program, and a cutting edge of the workpiece is also measured. Shape measurement, and then compare the measured reference surface measurement value of the shank and the actual shape measurement value of the cutting edge with the preset standard setting value of the shank and finishing processing shape setting value of the cutting edge, respectively. As a result of the comparison and determination, if there is no difference between the measured value and the set value that is greater than or equal to the predetermined allowable error, the machining is ended, and if there is a difference that is greater than or equal to the allowable error, it is determined that the cutting depth is insufficient. A grinding method, characterized in that a correction program is created and the work is further ground based on the correction program. 2. The comparison / judgment obtains a coefficient of a general formula representing the straight line or the curve from the measured value for each element of the straight line or the curve, and a general formula representing the straight line or the curve from the finish machining shape setting value. 2. The grinding method according to claim 1, wherein the coefficient is obtained, and then the coefficient for the measured value and the coefficient for the set value are compared for each element to determine whether or not the coefficient is within a predetermined tolerance. 3. When the coefficient of a general formula representing the straight line or curve is obtained from the measured value for each element of the straight line or curve, the measured value is matched from the continuity between the respective elements. The grinding method according to claim 2. 4. A grinding machine for grinding a work mounted and fixed on a table by means of a grindstone which can be moved back and forth, left and right, and up and down, and measures a shank reference surface and a cutting edge shape of the work. A measuring device provided accordingly, a moving means for moving the work relative to the measuring device, a shank reference surface and a cutting edge shape of the work measured by the measuring device while controlling the measuring device and the moving means. The measured value and the preset value are compared and judged, and if there is no difference between the measured value and the set value that is within the allowable error, the machining ends, but if there is a difference that exceeds the allowable error, correction processing is performed. A grinding device, which is provided with a control device for performing the grinding. 5. The moving means is configured to move a table, on which a work is placed and fixed, back and forth, left and right, and up and down with respect to a measuring device fixed to a grinding device. The grinding apparatus according to claim 4. 6. The moving means comprises a table on which a work is placed and fixed and which is fixed to a grinding apparatus,
The grinding apparatus according to claim 4, wherein the measuring apparatus is configured to move in the front-back, left-right, and up-down directions. 7. The grinding apparatus according to claim 4, wherein the measuring device is a touch sensor.