JPH084994B2 - Machine Tools - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a machine tool such as a grinding machine, a milling machine, a machining center, etc., and more specifically, comprises a measuring device for measuring a dimension of a workpiece. Regarding machine tools.

[Technical background of the invention and its problems] For example, when a workpiece is machined in a machine tool such as a grinder, a grinding wheel as a tool is worn,
Due to thermal displacement of the machine body, it is difficult to machine the workpiece from the beginning to the finished dimensions. Therefore, conventionally, after processing a workpiece to near the finished size, remove the workpiece from the machine tool, place the workpiece on the surface plate for precise measurement, and then re-install the workpiece on the machine tool. Set,
It is common to reprocess to finished dimensions based on the measurement results.

By the way, when precision machining of a workpiece is performed by a machine tool such as a grinder, finishing is performed to a size of several microns. Therefore, when the work piece is re-set on the machine tool, it is necessary to prevent adhesion of dust or the like and pay attention to reproducibility, which causes a problem in improving work efficiency and easily causes an error of several microns when re-setting. There was a problem such as.

[Object of the Invention] The present invention has been made in view of the conventional problems as described above, and an object of the present invention is to measure a finished dimension of a workpiece while the workpiece is mounted on a table in a machine tool. It is to provide a possible new processing machine.

[Summary of the Invention] In order to achieve the above object, in the present invention, a processing head for processing a workpiece on a table movably provided on a base is arranged above the table. At least one of the base and the table is provided with a first measuring device for measuring a moving dimension of the table, and a work detecting device having a detector for detecting a work piece at a lower end is provided on the table. A second measuring device is provided at an upper position so as to be vertically movable, and a second measuring device for detecting a vertical movement dimension of the work detecting device is provided.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, a case where a grinding machine is used as an example of a machine tool will be described. The present invention can be applied to other machine tools such as a milling machine and a machining center without being limited to the machine.

Referring to FIGS. 1 and 2, a grinder 1 illustrated as an example of a machine tool includes a saddle 5 on a base 3 formed in a box shape so as to be movable in the front-rear direction. Work table 7 on which workpiece W is placed
Is reciprocally supported in the left-right direction. A column 9 is erected on the rear side of the base 3, and a machining head 13 having a grindstone 11 as a machining tool rotatably supported on the column 9 is vertically movable. .

Further, a manual handle 15 for manually moving the saddle 5 back and forth and an appropriate servo motor (not shown) for automatically moving back and forth are mounted on the base 3. Although not shown in detail, the drive system for moving the saddle 5 back and forth is configured to be connectable to and disconnectable from the manual handle 15 and the servomotor via the clutch device. In other words, when the saddle 5 is moved back and forth by the manual handle 15, the transmission of power to the servo motor is cut off. Conversely, when the saddle 5 is automatically moved back and forth by the servo motor, the power to the manual handle 15 is cut. Is configured to be blocked.

The saddle 5 is equipped with a manual handle 19 for moving the work table 7 left and right with respect to the saddle 5,
Moreover, a motor 21 for automatically moving the work table 7 right and left is mounted on the base 3. Above manual handle
Since the configuration for moving the work table 7 left and right by the 19 and the motor 21 is a general configuration,
The details are omitted.

Further, a manual handle 23 for manually moving the processing head 13 up and down is rotatably mounted on the base 3, and a motor 17 for automatically moving the processing head 13 up and down is provided. ing.

In the above structure, after setting the work piece W on the work table 7 by a magnet chuck or the like, the grinding wheel 11 is rotationally driven by the motor 25 provided in the processing head 13. After that, the machining head 13 is lowered to make a cut in the grinding wheel 11 to the workpiece W, the work table 7 is appropriately moved left and right, and the saddle 5 is moved back and forth as necessary, so that the workpiece W is moved. It will be appreciated that processing can be performed on the. In addition, since the processing of the workpiece W as described above is a general processing,
The detailed description of the operation is omitted.

A first measuring device 27 is arranged between the base 3 and the saddle 5 in order to measure the machining dimension of the workpiece W. The first measuring device 27 is composed of a linear scale such as a linear magnescale or a linear inductosyn, and has a saddle 5 for the base 3.
It is for measuring the moving dimension of the front-back direction.
The detected value of the first measuring device 27 is input to an appropriate control device such as a counter described later.

A second measuring device 29 for detecting the vertical dimension of the workpiece W is attached to the processing head 13. The second measuring device 29 is composed of, for example, an actuating transformer and a suitable detector 33 such as the above-mentioned linear scale, and is vertically supported by the machining head 13 via a bracket 31.

More specifically, the detector 33 is internally provided with a vertically movable spindle 35, and is configured to detect the vertically movable position of the spindle 35. On the lower part of the spindle 35, a locking lever 39 is attached which can be engaged / disengaged with a stopper 37 provided on a part of the frame of the machine tool or a part of the bracket 31.

In addition, on the lower part of the spindle 35, the workpiece W
A work detection device 41 for detecting is attached. More specifically, an appropriately cylindrical detector housing 43 having an opening at the bottom is attached to the lower portion of the spindle 35, and a ring-shaped support base 45 is installed in the detector housing 43. The support base 45 is the detector housing 43.
It is fixed in the detector housing 43 by an appropriately tubular cap member 47 that is screwed in from below.

On the support base 45, in order to detect the workpiece W, a stylus 51 having a detector 49 at a lower end is swingably supported. More specifically, the detector 49 and the stylus 51 are made of a non-magnetic member having good electric conductivity, and the detector 49 is capable of contacting the workpiece W. In the present embodiment, It is formed into a highly accurate spherical shape. The upper portion of the stylus 51 penetrates the support base 45, and between the flange portion 53 provided at the upper end of the stylus 51 and the support base 45, an ammunition 55 such as a compression spring is mounted. . In addition, the support base 45
A fulcrum member 57 having an appropriate shape is appropriately attached to the stylus 51 on the lower side of the device by screwing or the like. This fulcrum member
Semi-cylindrical or hemispherical contact portions 59 are formed at a plurality of positions on the upper surface of 57, and each contact portion 59 is formed on the support base 45.
Is engaged with an appropriate number of V grooves 61 formed on the lower surface of the.

The stylus 51 has contact points 59 on the fulcrum member 57.
Is held in a vertical state when it is engaged with the V groove 61 of the support base 45, and when an external force in the horizontal direction is actuated, it can appropriately swing with an appropriate contact portion as a fulcrum.

The work detection device 41 having the above-described configuration detects the work piece W by passing a weak current between the work piece W and the detection piece 49 when the detection piece 49 contacts the work piece W. To do. In other words, a voltage is applied between the workpiece W and the detector 49 so as to energize at the time of contact.

Referring again to FIGS. 1 and 2, a counter 65 is attached to the column 9 via an attachment 63. The counter 65 displays the measurement results of the first measuring device 27 and the second measuring device 29, and when the detector 49 of the work detecting device 41 contacts the workpiece W, the first measuring device 27 The measurement values of the measuring device 27 and the second measuring device 29 are read.

In the above-described structure, after the workpiece W on the work table 7 is processed as described above, the depth of the groove from the upper surface of the workpiece W having the groove formed on the upper surface as shown in FIG. When measuring the height, first, the upper surface of the workpiece W to be measured is the work detection device.
The saddle 5 and the work table 7 are positioned so as to be located below 41. Next, the locking lever 39 is removed from the stopper 37, the spindle 35 and the work device 41 in the detector 33 are lowered, and the detector 49 in the work detection device 41 is brought into contact with the upper surface of the work piece W.

When the detector 49 is brought into contact with the upper surface of the work piece W as described above, the work piece W and the detector 49 are energized. Therefore, the detector 33
The detected value of is read into the counter 65 and the upper surface position of the workpiece W is displayed.

Next, after separating the detector 49 from the upper surface of the workpiece W, the saddle 5 and the work table 7 are repositioned so that the groove of the workpiece W is located below the detector 49. Then, the detector 49 is brought into contact with the bottom surface of the groove of the workpiece W, and the detection value of the detector 33 when the contact is made,
The depth of the groove can be measured by the difference from the detected value on the upper surface.

Therefore, based on the above measurement results, the workpiece W
By controlling the cutting of the grinding wheel 11 with respect to, the depth of the groove can be processed with high precision with the upper surface of the workpiece W as a reference.

In order to detect the width of the groove of the workpiece W or the thickness of the wall portion in the front and rear portions of the groove, the detector 49 in the work detection device 41 can contact the entire surface, the rear surface of the workpiece W, the front and rear surfaces of the groove, and the like. In this state, the saddle 5 is moved back and forth, and it can be easily detected based on the detection value of the first measuring device 27 when the detector 49 comes into contact with the workpiece W. That is, the front-back movement dimension of the saddle 5 moved to bring the detector 49 into contact with each surface of the workpiece W is detected, and the detector 49 is detected with respect to the detected value.
It is only necessary to correct the diameter of.

[Effects of the Invention] As will be understood from the above description of the embodiments, since the gist of the present invention is as described in the scope of claims, the work according to the present invention is based on an appropriate surface. When measuring the finished size of a piece, you can measure it with the workpiece mounted on the work table.
The work efficiency is improved, and the error caused by the attachment / detachment of the work piece does not occur.

By the way, the present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. For example, a configuration may be employed in which the work detection device or the like in the second measurement device is automatically moved up and down, or a configuration in which the second measurement device is attached to a fixed part such as a column via an appropriate support member. It is possible. Further, the detector may be a non-contact type, and further, various changes such as inputting the dimension measurement value of the workpiece to the NC control device without using a counter or the like are possible.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a front view of a grinding machine embodying the present invention, and FIG. 2 is a right side view of the same. FIG. 3 is a front view showing, in an enlarged cross section, a main portion of an arrow III portion in FIG. 3 …… Base, 7 …… Work table 13 …… Machining head, 27 …… Measuring device 49 …… Sensor, 41 …… Workpiece detecting device 29 …… Measuring device

Claims (4)

[Claims] 1. A machining head for machining a workpiece on a table, which is movably provided on a base, is provided above the table, and at least one of the base and the table has a moving dimension of the table. And a work detecting device provided with a detector for detecting a work piece at a lower end portion thereof so as to be vertically movable and provided above the table, and at the same time, the work detecting device is provided. A machine tool comprising a second measuring device for detecting a vertical movement dimension of the device. 2. The machine tool according to claim 1, wherein the work detection device is supported by a machining head. 3. A detector according to claim 1, wherein the detector is provided so as to be swingable with respect to the work detection device.
A machine tool according to item. 4. The machine tool according to claim 1, wherein the detector also serves as the detectors of the first measuring device and the second measuring device.