JPH04310369A - Automatic sizing grinding method and automatic sizing grinding device - Google Patents

Abstract

PURPOSE:To perform repeated shape corrective machining of high accuracy automatically without troublesome manual operation. CONSTITUTION:A measuring apparatus 29 is fitted to a grinding device to measure the dimension of a workpiece W held by the work table 3 of the grinding device, and a relative position between a grinding wheel 13 and the workpiece W is computed from the dimension measured result. The cutting edge quantity control of the grinding wheel 13 is performed on the basis of the computed relative position data and the target dimension of the workpiece W to grind the workpiece W. After grinding, the dimension of the workpiece W is measured again. The relative position between the grinding wheel 13 and the workpiece W is computed again from this dimension measured result, and the cutting quantity shortage part is detected on the basis of the recomputed relative position data and the target dimension. On the basis of this, the corrective grinding of the workpiece W is performed to finish the workpiece W into the target dimension.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic sizing grinding method and an automatic sizing grinding apparatus.

0002

[Prior art] As one of the high-precision shape correction processing methods,
BACKGROUND ART A numerically controlled (NC) grinding forming method using an optical profile grinder is conventionally known.

Generally, in a numerically controlled (NC) grinding forming method using an optical profile grinder, a reference line and a starting point drawn on a projection screen are
Grinding is started by manually aligning the projected images of the grindstone and the object to be ground on the projection screen, and the depth of cut is controlled by numerical control. After the machining is completed, the dimensions of the object to be ground are confirmed by checking the projected image on the projection screen, and the object to be ground is once removed from the grinder and precisely measured using a measuring device.

0004

[Problems to be Solved by the Invention] In the forming method using the optical profile grinding machine as described above, the projection images of the grinding wheel and the object to be ground on the projection screen are focused by manual operation. Variations in the focusing method cause differences in the depth of cut, which causes errors in finished dimensions. In addition, after machining is completed, if the workpiece is removed from the grinding machine and its dimensions are precisely measured using a measuring device, and correction machining becomes necessary, the workpiece must be returned to its original machining position. Otherwise, this would be a very difficult task.

[0005] Furthermore, even when grinding is performed on one workpiece in the same cycle during rough cutting, semi-finishing, finishing, etc. without removing the workpiece from the grinding machine, it is possible to check the amount of wear on the grindstone. , it is necessary to align the grinding wheel each time,
This variation in positioning also causes finishing dimensional errors.

The present invention has been made by focusing on the above-mentioned problems in the conventional molding method using an optical profile grinder, and it is possible to repeatedly increase height without requiring troublesome manual operations. It is an object of the present invention to provide an automatic sizing grinding method that can automatically perform accurate shape correction processing, and an automatic sizing grinding device used to implement this method.

[0007]

[Means for Solving the Problems] According to the present invention, the dimensions of the workpiece held by the workpiece holding means of the grinding device are measured by a measuring device attached to the grinding device, and The relative position between the grinding wheel and the object to be ground is calculated from the dimensional measurement results, and the depth of cut of the grinding wheel is controlled based on the calculated relative position data and the target dimensions of the object to be ground, thereby grinding the object to be ground. Machining is performed, and after the grinding process, the dimensions of the object to be ground are measured again by the measuring device, and the relative position between the grinding wheel and the object to be ground is calculated again from the measurement results of the dimensions, and the relative position data calculated again. Achieved by an automatic sizing grinding method characterized by detecting an insufficient depth of cut based on the target dimensions and performing a corrective grinding process on the object to be ground based on this, and finishing the object to the target dimensions. be done.

In order to achieve the above object, the automatic sizing grinding device according to the present invention includes a measuring device that is attached to the grinding device and measures the dimensions of the workpiece held by the workpiece holding means of the grinding device. , a relative position calculation means for calculating the relative position between the grinding wheel and the object to be ground from the dimension measurement result of the object to be ground measured by the measuring device; and relative position data calculated by the relative position calculation means and the object to be ground. a depth of cut control means for controlling the depth of cut of the grinding wheel based on the target dimensions of the object to be ground; and a depth of cut control means for controlling the depth of cut of the grinding wheel based on the target dimensions of the object to be ground and the relative position data calculated by the relative position calculation means after the grinding process. The grinding apparatus further comprises: an insufficient depth of cut detection means for detecting an insufficient depth of cut; and a correction grinding control means for performing corrective grinding of the object to be ground based on insufficient depth of cut data detected by the insufficient depth of cut detection means. It is a feature.

[0009]

[Operation] According to the above-described configuration, the dimensions of the workpiece to be ground are measured by the measuring instrument while the workpiece is held by the workpiece holding means of the grinding device, and the results of this dimension measurement are used to determine the relationship between the grinding wheel and the workpiece to be ground. The relative position is calculated by the relative position calculation means, and the grinding process of the workpiece is performed under the control of the cutting depth of the grindstone based on the calculated relative position data and the target dimensions of the workpiece, and after the grinding process, The dimension of the workpiece to be ground is measured again by the measuring device while it is held by the workpiece holding means of the grinding device, and the relative position between the grinding wheel and the workpiece is calculated again based on the result of this dimension measurement. The insufficient depth of cut portion is detected by the insufficient depth of cut portion detection means, and corrective grinding of the workpiece is performed based on the detected lack of cut data, and the workpiece is finished to the target dimensions by this corrective grinding process.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings.

FIGS. 3 and 4 show an embodiment of an automatic sizing grinding apparatus according to the present invention. Automatic sizing grinding equipment is
It has a grindstone unit 1 and a work table unit 3.

The grinding wheel head unit 1 includes a grinding wheel head cross-feeding slide 5 movable in the Y-axis direction, and a grinding wheel head cross-feeding slide 5 movable in the Y-axis direction.
A grindstone head vertical slide 7 provided above and movable in the X-axis direction, a grindstone main body 9 provided on the grindstone vertical slide 7, and an elevating mechanism provided on the grindstone main body 9 so as to be movable up and down. It has a table 11 and a grinding wheel 13 attached to the lifting table 11. The lifting table 11 is driven in the vertical direction by a lifting table driving motor 15, and the grinding wheel 13 is driven by a grinding wheel driving motor 17.
It is designed to be rotationally driven by.

The grinding wheel head horizontal feed slide 5 is driven in the Y-axis direction by a Y-axis motor 19, as shown in FIG. 1, and the grinding wheel head vertical feed slide 7 is driven in the It is designed to be driven in the X-axis direction by a shaft motor 21.

The work table unit 3 includes a table vertical movement device 23, a table traverse slide 25 provided on the table vertical movement device 23 and movable in the Y-axis direction,
It has a vertically moving worktable 27 that is provided on a table horizontally moving slide 25 and is movable in the X-axis direction, and the vertically moving worktable 27 is provided with a holding means for holding the workpiece W to be ground.

A measuring device 29 is attached to the lifting table 11. As schematically shown in FIG. 1, the measuring device 29 is movable in the Y-axis direction by the grindstone horizontal slide 5 and in the X-axis direction by the grindstone vertical slide 7. Vertical feed work table 2 at each position in the direction
The outer dimensions (outer shell position) in the X-axis direction of the workpiece W fixedly held on the grinding surface 3 are measured by a non-contact method such as a photoelectric method.

A position detector 31 in the Y-axis direction is provided on the horizontal slide 5 of the grindstone head, and a position detector 33 in the X-axis direction is provided on the vertical slide 7 of the grindstone head. Position detector 3
The position detection signals 1 and 33 are input to the NC device 35 together with the dimension measurement value signal of the measuring device 29.

The NC device 35 includes a relative position calculation means 37, a target dimension input means 39, a depth of cut control means 41,
It has an insufficient depth of cut detection means 43, a correction grinding control means 45, and a measurement control means 47 as a hardware configuration or a software configuration.

The relative position calculating means 37 uses the measured value of the dimension of the workpiece W measured by the measuring device 29 and the position detector 31.
, 33, the relative position of the grinding wheel 13 and the workpiece W fixedly held on the vertical feed work table 23 is calculated from the X-axis and Y-axis positions of the measuring device 29 detected by each of the measuring devices 29, 33. There is.

The depth of cut control means 41 uses data regarding the target dimension of the object W to be ground given by the target dimension input means 39 and the relative position between the object W to be ground and the grinding wheel 13 outputted by the relative position calculation means 37. A grinding program or a modified grinding program is automatically created based on the data related to the grinding process, or by comparison calculation based on the modified grinding data from the modified grinding control means 45 and the target dimensions of the object W to be ground. The machining program is executed to output a drive control signal for cutting control to the drive circuit 49 of the Y-axis motor 19 and the X-axis motor 21.

The insufficient depth of cut detection means 43 detects the distance between the workpiece W and the grinding wheel 1 by the relative position calculation means 37 after the grinding process.
3 and target dimension input means 39
Data regarding the target dimensions of the object W to be ground are taken in, and based on these data, the insufficient depth of cut portion of the object W to be ground is quantitatively detected.

The corrective grinding control means 45 determines whether or not the undercut area is within the allowable value based on the data of the undercut area detected by the undercut area detecting means 43, and if it is not within the allowable value, the undercut area is detected by the undercut area detecting means 43. The corrected grinding data based on the part data is output to the depth of cut control means 41 for corrective grinding of the object to be ground.

The measurement control means 47 controls the drive of the grinding wheel head transverse slide 5 in order to measure the dimension of the workpiece W in the Y-axis direction at each position in the X-axis direction by the measuring device 29. This program is executed to output a drive control signal for the Y-axis motor 19 to the drive circuit 49.

Next, using the grinding control flow shown in FIG. 2, the automatic sizing grinding method according to the present invention will be explained according to the operation of the automatic sizing grinding apparatus constructed as described above.

First, the measurement program held by the measurement control means 47 is executed, and as a result, the Y-axis at each position in the X-axis direction of the workpiece W fixedly held on the vertical feed work table 27 is executed. A dimension measurement in the direction is performed by the measuring device 29 (step 10).

The measured dimensions of the workpiece W in the Y-axis direction at each position in the X-axis direction by this dimension measurement are outputted to the relative position calculation means 37, and then the relative position calculation means 37 outputs them from the measuring device 29. The workpiece W to be ground and the grinding wheel 13 are fixedly held on the vertical feed work table 27 based on the dimension measurement values and the position data regarding the X-axis position and Y-axis position of the measuring device 29 from the position detectors 31 and 33. Calculation of the relative position with respect to the above is performed (step 20).

Next, data regarding the relative position between the workpiece W and the grinding wheel 13 is given to the depth of cut control means 41, and the depth of cut control means 41 inputs the target dimension of the workpiece W input from the target dimension input means 39. A grinding program is automatically created based on the data regarding the relative position of the object W to be ground and the grinding wheel 13 from the relative position calculation means 37 (step 30).

When the creation of the grinding program is completed, this grinding program is executed, and the Y for cutting control is sent to the drive circuit 49 according to the grinding program.
Drive control signals for the axis motor 19 and the X-axis motor 21 are output. As a result, the Y-axis motor 19 and the X-axis motor 21 are driven, and the grinding wheel head horizontal slide 5 moves in the Y-axis direction and the grinding wheel head vertical slide 7 moves in the X-axis direction. The object W to be ground, which is fixedly held at the grinding wheel 13, is ground into a predetermined outer shape and size (step 40).

When this grinding process is completed, the measurement program held by the measurement control means 47 is executed again, and as a result, the X of the workpiece W is fixedly held on the vertical feed work table 27. Y at each position in the axial direction
The dimension measurement in the axial direction is performed again by the measuring instrument 29 (step 50), and the relative position calculation means 37 calculates the dimension measurement value from the measuring instrument 29 and the measuring instrument 2 from the position detectors 31 and 33.
The relative position of the grinding wheel 13 and the workpiece W fixedly held on the vertical feed work table 27 is calculated again based on the position data regarding the X-axis position and the Y-axis position of 9 (step 60 ).

Next, data regarding the relative position between the workpiece W and the grinding wheel 13 is output to the depth of cut insufficient detection means 43, and the data regarding the relative position and the workpiece W are outputted to the depth of cut insufficient detection means 43. In this embodiment, the trajectory of the data regarding the relative position and the variable data of the grinding program as data representative of the target dimensions of the object W to be ground are compared, and the Quantitative detection of the amount of insufficient cutting of the grinding object W is performed (step 70).

[0030] Next, quantitative data on the amount of insufficient cut in the undercut portion of the workpiece W to be ground is outputted to the correction grinding control means 45, and it is determined whether or not this is within the allowable value (step 80). .

When the depth of cut of the workpiece W is within the allowable value, the grinding process is completed, and when the depth of cut of the workpiece W is outside the tolerance, the data regarding the relative position and Comparison calculations are performed with variable data of the grinding program as data representative of the target dimensions of the object W to be ground (step 90), and a corrected grinding program is automatically created based on the calculation results. (Step 100).

Next, the process returns to step 40 and the above-mentioned corrective grinding program is executed, and according to the corrective grinding process program, Y for cutting control is sent to the drive circuit 49.
Drive control signals for the axis motor 19 and the X-axis motor 21 are output. As a result, the Y-axis motor 19 and the X-axis motor 21 are driven, and the grinding wheel head horizontal slide 5 moves in the Y-axis direction and the grinding wheel head vertical slide 7 moves in the X-axis direction. The object W to be ground, which is fixedly held at the grinding wheel 13, is corrected and ground by the grinding wheel 13.

Thereafter, the detection of the workpiece W as described above, the automatic creation of a corrective grinding program based on the detected detection, and the execution of the corrective grinding program until the depth of cut shortage of the workpiece W becomes within the allowable value. Correction grinding is performed repeatedly. As a result, the workpiece W to be ground is automatically finished to the target dimensions.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto, and various embodiments are possible within the scope of the present invention. This will be obvious to those skilled in the art.

[0035]

As can be understood from the above explanation, according to the automatic sizing grinding method and automatic sizing grinding apparatus according to the present invention, the dimensions of the workpiece to be ground can be measured by the measuring instrument and held by the workpiece holding means of the grinding apparatus. The relative position between the grinding wheel and the object to be ground is calculated from this dimensional measurement result, and the cutting amount control of the grinding wheel is performed based on the calculated relative position data and the target dimensions of the object to be ground. The workpiece to be ground is first ground, and after the grinding process, the measuring device measures the dimensions of the workpiece while it is being held by the workpiece holding means of the grinding device. Based on the measurement results, the grinding wheel The relative position between the object and the workpiece is calculated again, the insufficient depth of cut is detected based on this, and the corrective grinding process of the workpiece is automatically performed based on the data of the detected insufficient depth of cut. Because it can be finished to the target dimensions, there is no need for troublesome manual operations such as positioning with a projector, confirmation work, removing and reinstalling the workpiece for precise measurement of the workpiece, and it is possible to repeatedly achieve high precision. Shape correction processing can now be performed automatically and efficiently.

[Brief explanation of drawings]

FIG. 1 is a perspective view schematically showing main parts of an automatic sizing grinding apparatus according to the present invention.

FIG. 2 is a flowchart showing an example of a grinding control flow for carrying out the automatic sizing grinding method according to the present invention.

FIG. 3 is a front view showing an embodiment of an automatic sizing grinding apparatus according to the present invention.

FIG. 4 is a front view showing an embodiment of an automatic sizing grinding apparatus according to the present invention.

[Explanation of symbols]

1. Grindstone unit 3 Work table unit 5　Wheelhead horizontal feed slide 7. Vertical feed slide of grindstone head 9 Whetstone head body 11 Lifting platform 13 Grinding wheel 13 27 Vertical feed work table 29 Measuring instrument 31 Position detector 33 Position detector 35 NC device 37 Relative position calculation means 39 Target dimension input means 41 Cutting amount control means 43 Insufficient depth of cut detection means 45 Modified grinding control means 47 Measurement control means 49 Drive circuit

Claims (2)

[Claims] [Claim 1] A measuring device attached to a grinding device measures the dimensions of an object to be ground held by a workpiece holding means of the grinding device, and calculates a relative position between a grinding wheel and the object to be ground from the result of the dimensional measurement. The cutting depth of the grindstone is controlled based on the calculated relative position data and the target dimensions of the workpiece, and the workpiece is ground. measuring the dimensions again, recalculating the relative position between the grinding wheel and the object to be ground from the result of the dimension measurement, and detecting an insufficient depth of cut based on the recalculated relative position data and the target dimension;
An automatic sizing grinding method characterized by performing a correction grinding process on the object to be ground based on this, and finishing the object to be ground to the target size. 2. A measuring device that is attached to a grinding device and measures the dimensions of the workpiece held by the workpiece holding means of the grinding device, and a grindstone based on the measurement results of the dimensions of the workpiece measured by the measuring device. and a relative position calculation means for calculating a relative position between the object and the object to be ground, and a cutting depth for controlling the depth of cut of the grindstone based on the relative position data calculated by the relative position calculation means and a target dimension of the object to be ground. a quantity control means, an insufficient depth of cut detection means for detecting an insufficient depth of cut based on the relative position data calculated by the relative position calculation means after grinding and a target dimension of the object to be ground, and the insufficient depth of cut detection means. An automatic sizing grinding apparatus comprising: correction grinding control means for performing correction grinding of the object to be ground based on the data of the insufficient depth of cut detected by the method.