JP3797393B2 - How to align the center height between the cutting tool and the workpiece - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for performing center alignment between a cutting tool and a workpiece of a multi-axis control machine such as a grinding machine or a lathe, that is, so-called center height alignment with high accuracy and simplicity.
[0002]
[Prior art]
Conventionally, as shown in FIGS. 5, 6, and 7, the center height alignment of a multi-axis control machine such as a grinding machine or a lathe is performed by holding the dummy workpiece 17 on the work chuck 2 and using the cutting tool 15 first. The shape is transferred to the dummy workpiece 17 to form a transfer mark 18. Next, the θ rotation shaft 4, that is, the work chuck 2 is rotated 180 degrees, and the tip shape of the blade 15 is transferred to the dummy work 17 in the same manner as described above to form a transfer mark 19. A method is generally employed in which the distance L3 between the center lines of the transfer trace 18 and the transfer trace 19 is measured, and the above transfer operation is repeated so that the distance L3 becomes zero.
[0003]
[Problems to be solved by the invention]
It is generally known that a low centering accuracy not only affects the shape accuracy among the workpiece processing accuracy, but also adversely affects the life of the machine body and the cutting tool.
[0004]
However, in the center height alignment method shown in the above prior art, there is an error in the measurement of the distance L3. When measuring the distance L3, the dummy workpiece 17 is removed from the work chuck 2, and after the measurement, the dummy workpiece 17 is mounted again. Highly accurate center height alignment, such as attachment errors when gripped by the work chuck 2, requires skill, and a method that can easily and accurately align the center height has been desired.
[0005]
Accordingly, the present invention provides a method for solving such problems and performing high-precision and simple core height alignment when using a blade tool in which the tip of the blade tool has a rotationally symmetric shape, particularly among the core height alignment. is there.
[0006]
[Means for Solving the Problems]
[0007]
The present invention achieves the above-mentioned object, and has an X-axis positioning unit that performs linear positioning in a horizontal direction, a Y-axis positioning unit that performs linear positioning in a horizontal direction orthogonal to the X-axis positioning unit, and a rotationally symmetric shape. And a spindle shaft having a tip having an arcuate shape, means for attaching the blade to the shaft, means for rotating the spindle shaft, and the spindle shaft portion joined to the X-axis positioning means or the Y-axis positioning means. A Z-axis positioning means for positioning the workpiece in the vertical direction, and a workpiece having an angle indexing function for holding and rotating the workpiece having a rotation axis in a direction orthogonal to the spindle axis, joined to the X-axis positioning means or the Y-axis positioning means. Using a multi-axis control machine having a rotating means and a chuck portion made on the basis of the workpiece rotating means, the cutting tool and the core of the work In the method of aligning, using a device for aligning the center height of the workpiece with the cutting tool, which is gripped by the chuck portion of the work rotating means and has a measuring means for measuring the distance from an arbitrary reference point to the cutting tool in a non-contact manner. The workpiece rotating means is rotated 180 degrees forward and backward from an arbitrary rotational position by the work rotating means, and the distance between the arbitrary reference point and the cutting tool at the time of forward rotation and reverse rotation is measured. The difference is obtained.
[0008]
[Action]
The cutting tool and workpiece centering method according to the present invention includes an X-axis positioning unit that performs linear positioning in a horizontal direction, a Y-axis positioning unit that performs linear positioning in a horizontal direction orthogonal to the X-axis positioning unit, and a rotationally symmetric shape. And a spindle shaft having a tip having an arc shape, a spindle shaft having means for attaching the blade to the shaft, a means for rotating the spindle shaft, and the spindle joined to the X-axis positioning means or the Y-axis positioning means Z-axis positioning means for positioning the shaft portion in the vertical direction; and an angle indexing function for holding and rotating the workpiece having a rotation axis in a direction orthogonal to the spindle axis, joined to the X-axis positioning means or the Y-axis positioning means. The workpiece rotating hand of a multi-axis control machine having a workpiece rotating means and a chuck portion made based on the workpiece rotating means A tool having a measuring means for measuring the distance from an arbitrary reference point to the cutting tool in a non-contact manner is used to align the core height of the workpiece with the tool rotating means. Rotate 180 degrees forward and backward from the rotation position, measure the distance between the arbitrary reference point and the cutting tool at the time of forward rotation and reverse rotation, determine the difference between the measured distances, By adjusting the center, that is, the core height, the core height can be adjusted with much higher accuracy and convenience than the conventional method.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, although one Example of this invention is described based on drawing, it is not limited to these.
[0010]
FIG. 1 is a side view of a multi-axis control machine according to this embodiment and a center height adjusting device held by a work chuck, and FIG. 2 is an enlarged view of the center height adjusting device and the cutting tool portion according to this embodiment.
[0011]
1 and 2, reference numeral 1 denotes a center height adjusting device of the present invention, and 16 denotes a length measuring sensor. Reference numeral 5 denotes an X-axis positioning means for linearly positioning in a substantially horizontal direction, and 6 denotes an X-axis drive motor and encoder. Reference numeral 8 denotes Y-axis positioning means for linearly positioning in a substantially horizontal direction orthogonal to the X-axis positioning means 5, and 9 denotes a motor and encoder for driving the Y-axis. 13 is a spindle unit for incorporating a motor (not shown) to rotate the cutting tool, 14 is a spindle shaft, 15 is a radius of curvature of 2 [mm] with a shape error of +0.005 to -0.005 [mm]. It is a cutting tool for cutting. A blade 15 is attached to the shaft end of the spindle shaft 14 so that the rotation axis of the spindle shaft 14 and the rotation axis of the blade 15 coincide. Reference numeral 12 denotes a Z-axis positioning means which can be positioned substantially in the vertical direction. Since the spindle unit 13 and the cutting tool 15 can be moved by the Z-axis positioning means 12, positioning in the vertical direction according to the height of the workpiece or the center height adjusting device (not shown) is possible. Reference numeral 11 denotes a Z-axis drive motor and encoder.
[0012]
Although not shown, the X-axis positioning unit 5, the Y-axis positioning unit 8, and the Z-axis positioning unit 12 incorporate a linear scale as a position detection unit.
[0013]
Next, reference numeral 4 denotes an X axis positioning means 5 having a rotation axis in a substantially horizontal direction orthogonal to the rotation axis of the spindle shaft 14 and capable of controlling the angular position for holding and rotating the workpiece or the centering device 1 not shown. It is a rotation axis. Reference numeral 2 denotes a work chuck that holds the work or center height aligning device 1 by aligning the work rotation axis with the rotation axis of the θ rotation axis 4 on the θ rotation axis 4.
[0014]
Next, a method for adjusting the core height with these configurations will be described.
[0015]
First, the spindle shaft 14 is rotated at an appropriate number of revolutions, and the cutting tool 15 is moved from the reference plane of the core height adjusting device 1 at the position of the blade height adjusting device 1 shown in FIG. The distance L1 to the surface of is measured. Next, the θ rotation shaft 4 is rotated 180 degrees from the position shown in FIG. This state is shown in FIG. In the state shown in FIG. 4, the distance L <b> 2 between the reference surface of the center height adjusting device 1 and the cutting tool 15 is measured in the same manner as described above.
[0016]
Next, the spindle unit 13 and the blade 15 are moved up and down in the vertical direction by the Z-axis positioning means 12 so that the difference between L1 and L2 approaches zero. If the difference between L1 and L2 is zero by the measurement of L1 and L2 and the vertical positioning using the Z-axis positioning means 12, the center of the cutting tool 15 and the center of the work chuck 2, that is, the center of the work rotation axis coincide with each other. Matching is complete.
[0017]
On the other hand, the conventional method is shown in FIGS. First, an appropriate amount of cut is made by the Y-axis positioning means 8, and the tip shape of the cutting tool 15 is cut and transferred to the dummy workpiece 17 as shown in FIG. Next, the θ rotation shaft 4 is rotated 180 degrees from the position shown in FIG. 5, and similarly, the tip shape of the blade 15 is cut and transferred to the dummy work 17 to make a transfer mark 19. This state is shown in FIG.
[0018]
Then, transfer marks 18 and 19 are cut and transferred to the dummy workpiece 17 as shown in FIG. The L3 shown in FIG. 7 is measured, and the center height is adjusted by relatively moving half the length of L3.
[0019]
Comparison of the core height accuracy between the center height alignment method shown in the example and the conventional method confirmed that the center height alignment is performed with a precision of about 20 times that of the conventional method. In addition, the machining accuracy of the workpiece was 5 times that of the conventional one, and it was confirmed that the machining accuracy was improved.
[0020]
In this embodiment, a blade having a curvature radius of 2 [mm] is used, but it goes without saying that it is limited to a specific curvature radius as long as it has a rotationally symmetric shape.
[0021]
In this embodiment, the non-contact sensor is used for measuring the length, but it is needless to say that even if a contact sensor is used, high-precision centering can be performed.
[0022]
【The invention's effect】
As described above, according to the cutting tool and workpiece centering method of the present invention, the X-axis positioning means, the Y-axis positioning means, the rotationally symmetric shape, the tip having an arc shape, and the cutting tool as an axis. A spindle shaft for rotating the attachment, a Z-axis positioning means for positioning the spindle shaft portion in the vertical direction, a work rotation means having an angle indexing function for holding and rotating the work in a direction perpendicular to the spindle axis; Measuring means for measuring the distance from an arbitrary reference point to the blade tool in a non-contact manner, gripped by the chuck portion of the workpiece rotating means of a multi-axis control machine having a chuck portion made on the basis of the workpiece rotating means A tool for aligning the center height of the cutting tool and the workpiece, the device is rotated forward and reverse 180 degrees from an arbitrary rotational position by the workpiece rotating means, and the arbitrary at the time of forward rotation and reverse rotation By measuring the distance between the reference point and the cutting tool, finding the difference between the measured distances, and aligning the center of the workpiece and the center of the cutting tool, that is, the center height, it is significantly more accurate and simple than the conventional method. It has the effect that the core height can be adjusted.
[Brief description of the drawings]
FIG. 1 is a side view of a multi-axis control machine according to an embodiment of the present invention and a centering device held by a work chuck. FIG. 2 is an enlarged view of a centering device and a cutting tool portion according to an embodiment of the present invention. .
FIG. 3 is a side view showing the measurement of the distance between the reference surface of the center height adjusting device and the blade surface.
4 is a side view showing measurement of the distance between the reference plane of the center height aligning device and the blade surface at a position obtained by rotating the θ rotation axis by 180 degrees from the position shown in FIG. 3;
FIG. 5 is a side view showing transfer to a dummy workpiece having a blade tip shape by a conventional centering method.
6 is a side view showing transfer onto a dummy workpiece having a blade tip shape at a position obtained by rotating the θ rotation axis by 180 degrees from the position shown in FIG. 5;
FIG. 7 is a diagram showing a transfer mark when the blade tip shape is transferred to the workpiece in the transfer to the dummy workpiece having the blade tip shape shown in FIGS. 5 and 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Center height aligner 2 Work chuck 3 (theta) rotation axis drive motor 4 (theta) rotation axis 5 X axis positioning means 6 X axis driving motor and encoder 7 Bed 8 Y axis positioning means 9 Y axis driving motor and encoder 10 Z axis Column 11 Z-axis drive motor and encoder 12 Z-axis positioning means 13 Spindle unit 14 Spindle shaft 15 Cutting tool 16 Non-contact type length measuring sensor 17 Dummy work 18 Transfer trace 19 Transfer trace 20 θ rotary shaft head

Claims (1)

  X-axis positioning means for linear positioning in the horizontal direction, Y-axis positioning means for linear positioning in the horizontal direction orthogonal to the X-axis positioning means, a rotationally symmetric shape, and a cutting tool having a circular arc tip, A spindle shaft having means for attaching a cutting tool to the shaft, means for rotating the spindle shaft, Z-axis positioning means for joining the X-axis positioning means or the Y-axis positioning means and positioning the spindle shaft portion in the vertical direction; A workpiece rotating means joined to the X-axis positioning means or the Y-axis positioning means and having a rotation axis in a direction perpendicular to the spindle axis and having an angle indexing function for holding and rotating the workpiece; In a method of aligning the center height of a cutting tool and a workpiece using a multi-axis control machine having a chucked portion, Using a device that aligns the center height of a workpiece with a cutting tool that is gripped by the chuck portion of the rotation means and has a measuring means that measures the distance from an arbitrary reference point to the cutting tool in a non-contact manner. The blade tool is rotated 180 degrees forward and backward from an arbitrary rotational position by means, the distance between the arbitrary reference point and the blade tool at the time of forward rotation and reverse rotation is measured, and the difference between the measured distances is calculated for each A method of aligning the workpiece center height.

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