JPS6141699B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measuring device using a measuring head that is detachably attached to the main shaft of an attachment in a machine tool, and uses light waves that are less susceptible to noise to transmit and receive measurement signals. The object of the present invention is to facilitate automatic measurement when attaching and detaching the measurement head and indexing the attachment by performing the measurement in a non-contact manner.

Hereinafter, an embodiment using light waves of the present invention will be explained with reference to the drawings. As shown in Fig. 1, this device can be freely attached to and detached from the main shaft of an attachment B which is attached to the spindle head A so that it can be freely indexed and rotated. A measuring head 1 attached to the measuring head 1 is provided with a transmitting device 2 that emits an optical signal when the measuring probe 1a comes into contact with an object to be measured, and the signal is received by the spindle head A in a non-contact manner via an attachment B. A receiving device 12 with a plurality of receiving sensors is provided.

In addition, as shown in FIGS. 2 and 3, the measurement head 1 can be automatically attached to and detached from the spindle of the attachment B which is detachable from the spindle head A using an automatic tool changer C in the same way as the cutting tool E. As shown in Figs. 2, 3, and 7, the measuring head 1 is provided with an adapter F similar to the adapter for the cutting tool E, and, like the tool E, connects the spindle of the spindle head A and the attachment B, and the tool magazine G. Automatic tool exchange is possible between the tool exchanger C and the storage container H using a conventional tool exchanger C having a known structure. C′ is the exchange arm. Then, as shown in Fig. 4, the X, Y, and Z coordinate values of the reference block D are measured using the probe 1a of the measurement head 1 attached to the spindle head A and the spindle of the attachment B that can rotate every 90 degrees. By setting this point as the origin of the program, the ram spindle head A of the NC machine tool,
Thermal displacement of attachment B etc. can be detected accurately and reliably. Furthermore, when the measurement probe 1a comes into contact with the reference block D, one to three switches of a well-known switching mechanism having three switches arranged at a 120° pitch in the measurement head 1 are instantly opened. , from the transmitting device 2 having a well-known structure.
A pulse voltage of f ₁ KHz is oscillated and output, and the transmission sensor 3 converts this into light (infrared rays, etc.) and transmits it. As shown in FIG. 7, case 2a of transmitter 2
is fixed to the head 1, and is turned on only when the lever 13a of the power supply battery limit switch 13 of the electric circuit is pushed by the edges of the spindle head A and the attachment B. 1st
In the figure, transmitted light emitted from a sensor 3 is transmitted to a fiberscope 5 attached to a fiber attachment jig 4 on the attachment side. The light guided by the scope 5 is received by the receiving sensors 8 to 11 via the fiber attachment jig 7, and the light is converted into an electrical signal, which is received by the receiving device 12 of a well-known structure within the spindle head A. The receiving device 12 discriminates between an electrical signal corresponding to the transmitted light and an electrical signal corresponding to light such as natural light, incandescent lamp, fluorescent lamp, etc., which causes disturbance noise, and receives an f ₁ KHz electrical signal. It is equipped with a detection function that extracts only the Furthermore, since the attachment B is indexed in four directions every 90 degrees with respect to the ram spindle head A, four receiving sensors 8, 9, 10, and 11 are provided as shown in FIGS. Note that the parts 3, 4, 7 to 11 are equipped with a mechanism that prevents optical transmission from being disturbed by oil, dust, chips, etc. from the outside. In FIG. 9, the protruding piece 14a of the attachment B is engaged with the engaging piece 14b of the spindle head A, but by rotating the attachment B by 45 degrees, it can be disengaged and removed.

As described above, the contact signal emitted from the measurement probe 1a is sent to the data processing device J via the receiving device 12 with almost no time delay. The data processing device J reads the coordinate values of the X, Y, and Z measurement reference scales SX, SY, and SZ at the timing of this signal.
The reference block D was measured from the three directions of X, Y, and Z, and if there was any thermal displacement in the ram spindle head A, attachment B, etc., the origin coordinates of the reference block D measured before and after the thermal displacement corresponded to the thermal displacement. This will cause a discrepancy in the amount. Automatic correction of thermal displacement, etc. is performed by instructing the NC device K to use this amount as a shift amount of the coordinate system to the axis feed motors MX, MY, and MZ of the X, Y, and Z axes.

For example, in contrast to the case where there is no thermal displacement of the attachment B as shown in Fig. 5a, even if there is a thermal displacement of △l in the Z-axis direction as shown in Fig. 5b, the reference block D is set before machining the workpiece M. By measuring and resetting the origin of machining, errors such as thermal displacement can be removed during machining.

Similarly, as shown in Figure 6, in addition to the reference block, points, holes, pins, and planes of the workpiece can be measured, and distances, widths, steps, parallelism, straightness, etc. can be calculated from the data of each point. This increases the machining accuracy of machined parts.
Inspection and judgment can be made in the same clamped state, which eliminates errors in machining and inspection accuracy due to setting, allows machining and inspection in a short time, and allows inspection to be performed under the same surrounding conditions as during machining. .

Further, the state in which the measuring head 1 is directly attached to the spindle head A is shown in FIGS. 8 and 9, and the measuring operation at this time will be omitted because it is easily understood from the above.

As is clear from the above description, the present invention provides a measurement head that is detachably attached to the spindle of an attachment that is detachably attached to the spindle head and rotatable in four directions in 90° increments. X,
It has one measurement probe that is movable in the Y and Z directions, the measurement head is provided with a transmitter that emits an optical signal that causes the measurement probe to come into contact with the object to be measured, and the spindle head is provided with a transmission device that emits an optical signal that causes the measurement probe to come into contact with the object to be measured. A receiving device with four receiving sensors arranged at 90° angles is provided, which non-contactly receives the light through an attachment, and the receiving device receives electrical signals corresponding to the light transmitted from the transmitting device and disturbance noise. The present invention relates to a measuring device for a machine tool, characterized in that it is equipped with a detection function that discriminates between light that is a factor and an electrical signal that corresponds to the optical signal and extracts only the electrical signal that corresponds to the optical signal from the transmitting device. .

Therefore, according to the invention, the transmitting/receiving device does not interfere at all when automatically attaching and detaching the measuring head, and the four receiving sensors corresponding to the indexing positions of the attachment allow one machine to operate the vertical spindle. Automatic measurement in 5 directions is possible even when attached to the horizontal spindle (attachment spindle). Also, since the measurement head has one measurement probe that can be displaced in the X, Y, and Z directions, one Vertical with probe
It is possible to measure in each of the five directions even in a horizontal state, and with this probe, you can quickly and accurately correct the machine by measuring the five sides of the workpiece and measuring the reference block, fully demonstrating the functions of the five-sided processing machine. can.

Further, the receiving device discriminates between electrical signals corresponding to the light transmitted from the transmitting device and electrical signals corresponding to the light that causes disturbance noise, and extracts only the electrical signals corresponding to the optical signals from the transmitting device. Since it is equipped with a detection function, it is not easily affected by surrounding light, and only the electrical signals detected by the detection function can be reliably received, allowing reliable detection.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall configuration diagram, Fig. 2 is a perspective view of the spindle head, and Fig. 3 is a perspective view of the spindle head.
The figure is a perspective view of the tool magazine part, Figure 4 is a diagram explaining the measurement state of the reference block, Figures 5 a and b are diagrams explaining the correction of errors such as thermal displacement, Figure 6 is a diagram explaining the measurement and calculation functions, and Figure 7 is a diagram explaining the measurement and calculation functions. is a partially cutaway side view of the measurement head.
Fig. 8 is a side view of the measuring head attached to the spindle head, Fig. 9 is a bottom view of Fig. 8, Fig. 10 is a side view of the attachment part with the measuring head, and Fig. 11 is a plan view of the same. . A: Spindle head, B: Attachment, C: Automatic tool changer, D: Reference block, E: Cutting tool,
1: measurement head, 1a: measurement probe, 2: transmitter, 3: transmitter sensor, 8, 9, 10, 11: receiver sensor, 12: receiver.

Claims (1)

[Claims] 1. A measurement head is detachably attached to the main shaft of an attachment that is detachably attached to the spindle head and can be indexed and rotated in four directions every 90 degrees, and the measurement head is movable in the X, Y, and Z directions. The measuring probe has a measuring probe, and the measuring head is provided with a transmitter that emits an optical signal when the measuring probe comes into contact with the object to be measured, and the optical signal is sent to the spindle head in a non-contact manner via an attachment. A receiving device with four receiving sensors arranged every 90 degrees is provided, and the receiving device receives electrical signals corresponding to the light transmitted from the transmitting device and electrical signals corresponding to the light causing disturbance noise. 1. A measuring device for a machine tool, characterized in that the measuring device is equipped with a detection function that discriminates between the optical signal and the optical signal from the transmitting device and extracts only the electrical signal corresponding to the optical signal from the transmitting device.