JPH10249676A - Machining method for work by numerically controlled machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a work efficiently machinable by simplifying the setup work before machining. SOLUTION: A positioning pin hole 3 is installed in a work holding plate 2 equipped with a work fixture, while each reference pin hole of the same diameter as this pin hole 3 is installed in a measuring auxiliary plate 12 installed on a table 11 of a digital three-dimensional coordinate measuring machine and a machining auxiliary plate installed on a table of a numerically controlled machine tool at the same position. Then, the work holding plate 2 with a work is positioned on the measuring auxiliary plate 12 with a pin, and a work central position to the reference pin hole center and a work top face position to a surface of the measuring auxiliary plate both are measured by the measuring machine, inputting each measured value into the numerically controlled machine tool, and the work holding plate with the measured work is positioned on the machining auxiliary plate with the pin, whereby the work is machined on the basis of a surface position of the premeasured machining auxiliary plate and data of the reference pin hole center position as well as each measured value by the measuring machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of machining a work by a numerically controlled machine tool, and more particularly, to a method of machining a work in which setup operations before machining are simplified.

[0002]

2. Description of the Related Art In general, in a numerically controlled machine tool such as a machining center, a workpiece mounted on a table via a fixture or the like before machining is mounted in a X-, Y-, or Z-axis direction (two axes, such as a wire cut electric discharge machine). In the case where only control is performed, the position in the X and Y axes) is measured by, for example, contacting a work with a dial gauge or the like attached to the spindle and inputting the spindle position at the time of the contact to the numerical control unit of the machine tool. Since the machining is performed based on the obtained position data, a large amount of time and labor is required for the setup work before the machining, which is an obstacle to improving the operation rate of the numerically controlled machine tool.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems by using a numerically controlled machine tool capable of simplifying the setup work before machining and efficiently machining the work. An object of the present invention is to provide a processing method.

[0004]

According to a first aspect of the present invention, there is provided a method of processing a workpiece by a numerically controlled machine tool, comprising: a plurality of pins for positioning pins to be inserted into and removed from a workpiece holding plate having a workpiece fixture. Along with the hole, the auxiliary plate for measurement mounted on the table of the digital three-dimensional coordinate measuring machine and the auxiliary plate for processing mounted on the table of the numerical control machine tool have the same diameter as the pin hole. A reference pin hole is formed at the same center-to-center distance as each of the pin holes, and the work holding plate with a work to which a work is attached by the work mounting tool is superimposed on the auxiliary measuring plate, and the pin hole is formed. In the state where the work holding plate portion positioned by inserting a pin into the reference pin hole is tightened and fixed on the auxiliary measuring plate, the digital three-dimensional coordinate measuring machine The center position (relative position) of the work with respect to the reference pin hole center position and the upper surface position (relative position) of the work with respect to the surface of the measuring auxiliary plate are measured, and these measured values are numerically controlled. The work holding plate with the work having been measured is removed from the auxiliary plate for measurement, and is placed on the auxiliary plate for processing, and is positioned by inserting a pin into the pin hole and the reference pin hole. The work holding plate portion is tightened and fixed on the processing auxiliary plate,
The position data of each reference pin hole center position of the processing auxiliary plate and the surface position of the processing auxiliary plate, which are measured in advance on the numerical control machine tool, and the position data of the digital three-dimensional coordinate measuring machine. A method of machining a workpiece by a numerically controlled machine tool that performs machining of a workpiece in three axial directions such as a machining center, for example, by machining the workpiece by the numerically controlled machine tool based on measured values. Suitable for.

According to a second aspect of the present invention, there is provided a method of machining a work by a numerically controlled machine tool, wherein a plurality of pin holes into which pins for positioning are inserted and removed are passed through a work holding plate provided with a work fixture. In addition to the above, a reference pin hole having the same diameter as the pin hole is formed on the auxiliary plate for measurement attached on the table of the digital three-dimensional coordinate measuring machine and the auxiliary plate for processing attached on the table of the numerical control machine tool. Each of the pin holes is drilled at the same center-to-center distance, and the work holding plate with the work to which the work is attached by the work mounting tool is overlaid on the auxiliary measuring plate,
In the state where the work holding plate portion positioned by inserting a pin into the pin hole and the reference pin hole is fastened and fixed on the auxiliary measuring plate, the reference pin hole center position is measured by the digital three-dimensional coordinate measuring machine. The center position (relative position) of the work with respect to is measured, and the measured value is input to a numerical control unit of a numerically controlled machine tool, and the work holding plate with the measured work is removed from the auxiliary plate for measurement. Then, the work holding plate portion, which is overlapped on the processing auxiliary plate and positioned by inserting a pin into the pin hole and the reference pin hole, is tightened and fixed on the processing auxiliary plate. In each position data of each reference pin hole center position of the working auxiliary plate that has been measured in advance, and also the measured value by the digital three-dimensional coordinate measuring machine Machining the workpiece by the numerically controlled machine tool, and machining the workpiece by a numerically controlled machine tool for machining the workpiece in two axial directions, such as a wire cut electric discharge machine. Suitable for the method.

In the present invention, the work is mounted on the work holding plate, and the reference is located at the same position on the measuring auxiliary plate of the digital three-dimensional coordinate measuring machine and the processing auxiliary plate of the numerical control machine tool. Since the work is mounted while being positioned by the pin holes, the work is located at the same relative position to each reference pin hole on both auxiliary plates. Therefore, the relative position data of the center of the work on the auxiliary plate for measurement by the digital three-dimensional coordinate measuring machine with respect to the center position of the reference pin hole can be used as it is as the work center position data on the auxiliary plate for processing. Further, in the present invention, the upper surface of the work is located at the same relative position to the surfaces of the auxiliary plate for measurement and the auxiliary plate for processing, which are the mounting surfaces of the work holding plate. The position data of the upper surface of the work on the plate with respect to the surface of the auxiliary plate for measurement can be used as it is as the position data of the upper surface of the work on the auxiliary plate for processing. Therefore, by inputting the position data of these workpieces by the digital coordinate measuring machine to the numerical control unit of the numerical control machine tool,
This eliminates the need to measure the position of the work when mounting it on the processing auxiliary plate.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a work holding plate 2 having a three-jaw chuck 1 on one side as a work mounting tool for mounting a work W. A work holding plate 2 made of a steel plate whose both surfaces are finished is provided with two pin holes 3 and 3 therethrough at a predetermined center distance S, and the pin holes 3 have a predetermined accuracy (for example, H7). Finished to the inner diameter of ().

Reference numeral 4 denotes a positioning pin which is inserted into the pin hole 3 and reference pin holes 13 and 24 which will be described later. Various positioning pins such as spring pins can be used. When a pin having a diameter of about 10 to 20 mm that can adjust the diameter is used as in a positioning and fixing plug described in US Pat.
By adjusting the diameter after inserting the pin into the pin hole, positioning can be performed with high precision, and by adjusting the diameter, it is easy to insert into and remove from the pin hole. The plug is shown as a pin 4. This positioning and fixing plug is provided with a truncated cone 4c fitted into a tapered hole of a sleeve 4b provided with a plurality of slits 4a alternately in the longitudinal direction, and a bolt having a head 4d exposed at one end for rotating operation. Is driven in the longitudinal direction to elastically deform the sleeve 4b to change its outer diameter by a small amount.
Reference numeral 5 denotes a mounting hole through which a bolt 6 for tightening is inserted.

In FIG. 2, reference numeral 11 denotes a table of the digital three-dimensional coordinate measuring machine C, and reference numeral 12 denotes an auxiliary measuring plate fixedly mounted on the table 11 by bolts (not shown). On a measurement auxiliary plate 12 made of a steel plate whose both surfaces are finished, two pieces of the same center distance S as that of the work holding plate 2 and the same diameter and the same precision as the pin holes 3 are formed. Reference pin holes 13 and 13 (both may be bottomed holes or through holes) are formed. Reference numeral 14 denotes a screw hole into which the bolt 6 is screwed.

In FIG. 3, reference numeral 21 denotes a table (work table) having an index function of a machining center M comprising a three-axis control horizontal machining center which is a numerically controlled machine tool, and 22 denotes a scale mounted on the table 21; An auxiliary plate 23 for processing is attached to a side surface 22a of the scale 22 with a bolt (not shown).
Are fixedly mounted over two stages. A processing auxiliary plate having the same configuration may be mounted on the other side surface of the scale 22, or a processing auxiliary plate having a different configuration may be mounted depending on the type of the work or the type of the work fixture.

The working auxiliary plate 23 is also made of a steel plate whose both sides are finished, and has the same center-to-center distance S as that of the work holding plate 2 and the same diameter and the same accuracy as the pin holes 3. In this example, two sets of pin holes 24, 24 (both may be bottomed holes or through holes) are formed. Reference numeral 25 denotes a screw hole into which the bolt 6 is screwed. FIG. 3 shows a state in which the work holding plate 2 is attached to the right side portion of the upper processing auxiliary plate 23 in the drawing. Reference numeral 26 denotes a cutter (tool) attached to the main shaft.

In order to set up the processing using the above-described devices, first, in the digital three-dimensional coordinate measuring machine C, a probe (not shown) is set in a state before the work holding plate 2 shown in FIG. The surface position (Z) of the auxiliary plate for measurement 12 and the reference pin holes 13
The center position (X, Y) of No. 3 is measured. (Hereinafter, this measurement is referred to as pre-measurement.)

Then, the work W is mounted on the work holding plate 2 by the three-jaw chuck 1, and the work holding plate 2 with the work mounted is mounted on the table of the digital three-dimensional coordinate measuring machine C as shown in FIG. Auxiliary plate 1 for measurement on 11
2 and two pins 4 are inserted into the pin holes 3 and the reference pin holes 13.
, The work holding plate 2 is positioned and tightened and fixed on the auxiliary measuring plate 12 with the bolts 6. In this state, a contact operation of the probe (not shown) with the work W portion causes the center position (X, Y values) of the work with respect to the center position (measured as described above) of each of the reference pin holes 13, 13, and the auxiliary measurement. The upper surface position (Z value) of the work W with respect to the surface of the plate 12 (measured as described above) is measured,
These measured values are input to a numerical control unit of the machining center M that processes the work W.

On the other hand, in the machining center M,
In the state before the work holding plate 2 is mounted, the surface position (Z) of the processing auxiliary plate 23 and the center position (X, Y) of each reference pin hole 24 are operated by operating a probe (touch sensor) mounted on a spindle head (not shown). Is measured. (Hereinafter, this measurement is referred to as pre-measurement.)

Then, the work holding plate 2 with the work W is detached from the measuring auxiliary plate 12, and when the processing time comes, the work supporting plate 23 mounted on the scale 22 of the machining center M is put on the working auxiliary plate 23. The work holding plate 2 is stacked, and two pins 4 are inserted into the pin holes 3 and the reference pin holes 2.
4 and 24, the work holding plate 2 is positioned and tightened and fixed on the processing auxiliary plate 23 with the bolts 6.

The relative position of the center of the work W with respect to the centers of the pin holes 3 and 3 of the work holding plate 2 (that is, the centers of the reference pin holes 24 and 24 concentric therewith) and the surface of the auxiliary plate 12 for measurement ( That is, the upper surface position of the work with respect to the surface of the processing auxiliary plate 23 which is in the same plane state has been input to the numerical control unit of the machining center M as described above. 23 surface position data and reference pin hole 2
The center position and the surface position of the workpiece W on the machine coordinates of the machining center M can be immediately calculated from the center position data of No. 4 and the machining can be started based on this. In other words, by simply mounting the work holding plate 2 on which the work W is mounted on the auxiliary processing plate 23, the machining can be started without performing any position measurement of the work W.

The pre-measurement in the machining center M and the digital three-dimensional coordinate measuring machine C may be performed once when the auxiliary processing plate 23 and the auxiliary measurement plate 12 are exchanged. The time is short, and the measurement of the center position and the upper surface position of the work W in the digital three-dimensional coordinate measuring machine C can be performed during the machining of another work in the machining center M. It is not necessary to interrupt the machining, and the machining center only needs to be interrupted during the attachment of the workpiece holding plate 2 with the workpiece to the machining auxiliary plate 23 (and removal after machining) as described above. The operating rate of M is greatly improved.

In the above example, the three-jaw chuck 1 is used as a work fixture. However, as shown in FIG. 4, a vise 31 suitable for a rectangular work W is used as the work fixture, or as shown in FIG. Then, a clamp-type work fixture 35 having a stand 32, a clamp plate 33, and a clamp bolt 34 is used, or a round bar-shaped work drilled in the rectangular work holder 2 as shown in FIG. Alternatively, a screw-type work attachment 38 or the like including a hole 36 and a tightening screw 37 screwed into the hole 36 from the side may be used. In these figures, the same or corresponding parts as those in FIG.
And the same reference numerals.

In the above example, a machining method using a machining center that performs machining in three axial directions has been described.
In the case of a wire-cut electric discharge machine that performs machining in two-axis directions, each measurement in the Z-axis direction in the above example may be omitted. In this case, as a work holding tool, for example, a clamp-type work mounting tool 35 shown in FIG. 5 described above is suitable because a wire for electric discharge machining penetrates the work W. The work holding plate 2 may be provided with a notch or an opening so as not to hinder work penetration.

The present invention is not limited to the above examples. For example, the processing auxiliary plate may be directly mounted on the table of the numerical control machine tool, or a base plate other than the scale mounted on the table and other various mountings. It may be attached to a tool. In addition, three or more pin holes 3 and reference pin holes 13 and 2 are used for positioning one work holding plate.
4 may be used, and a plurality of sets of pin holes 3 and reference pin holes 13 and 24 and a plurality of sets of reference pin holes 13 and 24 may be formed on the auxiliary plate for measurement and processing so that the plurality of types of work holding plates can be used for positioning and mounting. May be provided. The present invention can also be applied to a method of processing a workpiece by a numerically controlled machine tool other than the machining center and the wire cut electric discharge machine, such as an NC grinding machine, an NC milling machine, and an NC (three-dimensional) electric discharge machine.

[0021]

As described above, according to the present invention,
When the work is mounted on the table of the numerically controlled machine tool,
There is no need to measure the position of the work, and it is only necessary to position and fix the work holding plate on which the work is mounted to the auxiliary processing plate with a pin, so that the mounting operation can be performed quickly and easily, and the work before processing can be performed. The setup work is simplified, the work can be efficiently processed, and the operation rate of the numerically controlled machine tool is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a work holding plate with a work holding tool showing an example of an embodiment of the present invention.

FIG. 2 is a perspective view of a table section of a digital three-dimensional coordinate measuring machine provided with a measuring auxiliary plate to which the work holding plate of FIG. 1 is attached.

3 is a perspective view of a table portion of a machining center provided with a processing auxiliary plate to which the work holding plate of FIG. 1 is attached.

FIG. 4 is a perspective view showing a second example of a work holding plate provided with a work fixture.

FIG. 5 is a perspective view showing a third example of a work holding plate provided with a work fixture.

FIG. 6 is a perspective view showing a fourth example of a work holding plate provided with a work fixture.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Three-jaw chuck (work attachment), 2 ... Work holding plate, 3 ... Pin hole, 4 ... Pin, 11 ... Table, 12 ... Auxiliary plate for measurement, 13 ... Reference pin hole, 21 ... Table, 22 ... Ikeir, 23 ... Auxiliary plate for processing, 24
... Reference pin hole, 31 ... Vise (work fixture), 35 ...
Work mounting fixture, 36: hole, 37: tightening screw, 38: work mounting tool, W: work, C: digital three-dimensional coordinate measuring machine, M: machining center (numerical control machine tool).

Claims (2)

[Claims] A work holding plate provided with a work mounting fixture is provided through a plurality of pin holes through which pins for positioning are inserted and removed, and is mounted on a table of a digital three-dimensional coordinate measuring machine. In the auxiliary plate for measurement and the auxiliary plate for processing mounted on the table of the numerical control machine tool, a reference pin hole having the same diameter as the pin hole is formed at the same center distance as each of the pin holes. Stacking the work holding plate with the work to which the work is attached by the work mounting tool on the auxiliary measuring plate, and positioning the work holding plate portion positioned by inserting a pin into the pin hole and the reference pin hole. With the digital three-dimensional coordinate measuring machine tightened and fixed on the auxiliary measuring plate, the center position of the workpiece relative to the central position of the reference pin hole and the auxiliary measuring plate are measured. Measure the position of the upper surface of the work relative to the surface of the rate, input these measured values to the numerical control unit of the numerically controlled machine tool, and remove the work holding plate with the measured work from the auxiliary plate for measurement. Then, the work holding plate portion, which is overlapped on the processing auxiliary plate and positioned by inserting a pin into the pin hole and the reference pin hole, is tightened and fixed on the processing auxiliary plate. Based on the position data of each reference pin hole center position of the processing auxiliary plate and the surface position of the processing auxiliary plate that have been measured in advance, based on the measured values by the digital three-dimensional coordinate measuring machine, A method of processing a workpiece by a numerically controlled machine tool, wherein the numerically controlled machine tool processes the workpiece. 2. A work holding plate provided with a work mounting fixture, which is provided through a plurality of pin holes through which pins for positioning are inserted and removed, and is mounted on a table of a digital three-dimensional coordinate measuring machine. In the auxiliary plate for measurement and the auxiliary plate for processing mounted on the table of the numerical control machine tool, a reference pin hole having the same diameter as the pin hole is formed at the same center distance as each of the pin holes. Stacking the work holding plate with the work to which the work is attached by the work mounting tool on the auxiliary measuring plate, and positioning the work holding plate portion positioned by inserting a pin into the pin hole and the reference pin hole. With the digital three-dimensional coordinate measuring machine measuring the center position of the workpiece with respect to the center position of the reference pin hole in a state of being fixedly fixed on the auxiliary plate for measurement, While inputting to the numerical control unit of the numerical control machine tool, the work holding plate with the work having been measured is detached from the auxiliary plate for measurement and is superimposed on the auxiliary plate for processing, and the pin holes and the reference pin holes are moved. The work holding plate portion positioned by the insertion of the pin is tightened and fixed on the processing auxiliary plate, and the center of each reference pin hole of the processing auxiliary plate measured in advance on the numerically controlled machine tool. Each position data of the position,
A method of machining a workpiece by a numerically controlled machine tool, wherein the workpiece is machined by the numerically controlled machine tool based on the measured value by the digital three-dimensional coordinate measuring machine.