JPS5890443A - Signal transmitting device in measurement of work to be machined - Google Patents

Abstract

PURPOSE:To surely transmit a signal while maintaining the mechanical accuracy of a sensing device by delivering and receiving a signal between a sensing head rotatably housed within a main shaft cylinder and a control part provided on the outside of the main shaft cylinder, through a non-contact type signal delivery and receiving means. CONSTITUTION:A sensing head 15B is mounted on a main shaft 15A rotatably supported within a main shaft cylinder 41 by means of static pressure bearings 42, 43. By providing the primary coil 48A of a rotary transformer 48 on the main shaft cylinder 41 side and a secondary coil 48B on the sensing head 15B side between the rear part outer periphery of the sensing head 15B and the front end of the main shaft cylinder 41, a sensed signal from the sensing head 15B is taken out to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the dimensions, roundness, and
Regarding a system for measuring straightness, etc., when the detection head for measurement is configured to be rotatable, the command signal to the detection head and the measurement data signal from the head are transmitted between the rotating part and the fixed part. The present invention relates to a signal transmission device that performs transmission and reception.

] Conventionally, in order to measure the dimensions, shape, etc. of each part of a machined workpiece (hereinafter referred to as a machined workpiece), the machined workpiece was placed on a surface plate exclusively for measurement. The measurer uses measuring instruments and jigs to perform the necessary measurements and obtain data such as dimensions.

However, in a machining system where machining work is performed unmanned, when focusing on a single workpiece, measurements are not taken after all machining has been completed; It may be necessary to measure and record certain machining dimensions before machining is completed.

In such cases, considering that the workpiece must be transported to the next remaining processing area after the measurement operation,
In the above-mentioned method of measuring work on a surface plate by a measuring worker, the workpiece is attached and removed. Work efficiency also decreases in terms of movement, etc., and measurement accuracy tends to vary. Therefore, as expressed in technical terms such as in-process measurement,
Particularly for unmanned machining systems, a method of associating a measuring unit device that can automatically carry out measuring operations on a workpiece during a series of mechanical machining operations with a drive system of a machining unit is necessary. be.

This concept has already been realized in the case of turning, grinding, etc. of shaft objects by adding a measuring device to a part of the processing machine as an auxiliary device.

On the other hand, among processed products, those that involve processing on a flat surface (milling) or drilling (boring), such as gear box bodies and valve bodies, as well as those that have multiple machined surfaces, cannot be processed. Since there are many types of measurements, the types or items to be measured are extremely diverse. Therefore, for such processed products, the above-mentioned method of adding an auxiliary measuring device to a part of the processing machine is structurally unreasonable in terms of automatic measurement due to the variety of measurements. , it is necessary to install a measurement unit exclusively for measurement. It becomes necessary to provide -*.

By the way, in such a measuring device,
When measuring the inner circumferential surface of a drilled hole, it is necessary to rotate the detection element for measurement. It must be configured to be rotatably supported.Then, various signal groups (command signals to the detection element, command signals to the detection element, The problem is how to transmit the measured data signal from the

In such a case, a method is generally used in which a slip ring or a photocoupler is provided inside the main shaft cylinder and the signal group is received and received via these.

However, it is not foolish to perform machining to accommodate them inside the main shaft block, which is extremely troublesome in terms of work, and considering that the main shaft is a power transmission means for transmitting rotation, However, there remain problems from the viewpoint of physical strength. moreover,
Workability is poor when assembling and repairing parts.

．． The purpose of the 7-blade is to solve the problems of mechanical processing of the inside of such a spindle blind for the installation of special equipment, that is, the problem of reduced workability and mechanical strength. An object of the present invention is to provide a signal transmission device.

Therefore, in the present invention, the main shaft is attached to the main shaft cylinder. A detection head including a detection element for measurement is attached to the tip of the main shaft, and a command signal is sent to the detection head from the control unit and a command signal is sent from the detection head to the control unit. The above objectives are achieved by providing a non-contact signal transfer means for transmitting the applied measurement data signal outside the main shaft cylinder. L is what I'm trying to do.

゛・． Electricity. 1. First, the measurement unit device which is the object of the present invention. The key points will be explained with reference to FIG.

1'' In the same figure, 11 is the main body of the measurement unit device;
12 is the bed. Ha to bed 12, guide 12A
, 12B, the saddle 13 is moved in the left-right direction (X direction) in the figure.
The column 14 moves in the longitudinal direction (two directions) in the figure via a guide 13113B provided on the saddle 13, and further moves the spindle head l5 via a guide (not shown) provided in the column 14.
are provided movably in the direction perpendicular to the plane of the figure (Y direction). The spindle head 15 has a detection element 15 at its tip.
A main shaft 1 on which a detection head 15B including C is removably attached.
5A is rotatably housed and supported.

21 is the introduction part of the gulet, part of which is shown in the figure. The motherlet introduction section 21 is provided with a slot for positioning the workpiece W fixed on the pallet PLT from a machining area (not shown) near the detection head 15B and performing various measurement operations on the workpiece W. pants}
Reference numeral 31 is a detection head housing section provided with a PLT loading/unloading path VIA. The storage section 31 includes a detection head storage shelf 31A that stores a group of various detection heads 15B that are selectively attached to the main shaft 15A in correspondence with each other at a glance. A calibration stand 3 jB that calibrates the detection head 15B, and a detection head automatic exchange that operates to attach the calibrated detection head 15B to the main shaft 15A or to remove the used detection head 15B from the main shaft 15A in order to use it for measurement. It consists of a device 31C and a control section 31D that controls these drives. In the calibration stand 31B, when a new detection head 15B is attached to the main shaft 15A by the detection head automatic exchange device 31C, the detection head 15B is calibrated.

Reference numeral 54 denotes a control section of a measurement unit device that controls each part of the measurement utility device shown in the figure. The control section includes the main body 11.
Co/Trow-Silla 32 for the part, said A?・Ya Reno in Let introduction part 21}
PLT positioning and rotation indexing (Pallet at the position shown in the figure)
A rotation command is given to rotate the PLT by a predetermined angle, for example, by 90 degrees clockwise. ) to command the controller 3
3 and the control section 31D of the storage section 31 are connected to each other, and information INF (W) from the processing unit side control section 35 indicated by a broken line is provided. This information INF (W) is information that identifies the processed article W as a measurement target when the processed article W is introduced from the processing unit device (not shown) region to the measurement unit device side,
For example, a group of commands necessary for measurement work are sent to the control unit 34 in advance.
In the case where the processed article W is stored, the content may simply be to specify the processed article W.

- On the other hand, the controller 32 gives a group of movement commands for the saddle 13, column 14, and spindle head 15 of the measurement main body 11 in the XY and Z-axis directions according to the measurement content, and also provides the measurement data signal measured thereby. At the same time, the data DAC obtained by the calibration in the calibration stand 31B is provided via the line L11L2. It is now possible to As a result, in the controller 32, the measurement data signal and the calibrated data DAC are combined to obtain a true measurement value for a certain measurement item on the workpiece W.

A specific problem of the present invention is that in the measurement system as described above, the controller 32 and the detection A.
The object of the present invention is to provide a signal transmission device that serves as a path for various signal groups (command signals, measurement data signals) associated with the execution of measurement operations.

An embodiment of the present invention embodying a signal transmission device will be described with reference to FIGS. 2 and 3.

FIG. 2 shows the internal structure of the spindle head 15 in FIG. 1. In the figure, reference numeral 41 indicates a main shaft cylinder housed in addition to the main shaft head 15. The main shaft 15A is inserted into the main shaft cylinder 41 via hydrostatic bearing cylinders 42 and 43 located on both open end sides thereof.
is rotatably provided. The hydrostatic bearing cylinder 42, 43 has a compressed air supply port 44 attached to the main shaft cylinder 4l.
．． Air supply grooves 42A and 43A are respectively formed to supply compressed air supplied from 45 to the outer peripheral sliding surface of the main shaft 15A. Further, the central axis of the main shaft 15A has a gradual slope of -.゛、
:, The first hole 46A1 in the shape of a taper whose diameter has been reduced to ゜゜, and then through the clearance groove 46B whose diameter has slightly expanded from the end, it is approximately the same.
'． 1. Second hole 46C that continues toward the rear end at 7, so, 1 ρ
Third hole portion 46D1 whose diameter expands in a step-like manner from the rear end 46D1+1゛The third hole portion 4 whose diameter expands in a step-like manner from the rear end and opens toward the rear end surface
6g are formed in sequence.

t・,l The detection head 15 is located in the first hole 46A.
A Tee-Goo shank 47 having a locking portion 47A formed at the rear end of B is inserted in a tight state. Further, a rotary transformer 48 is provided between the rear outer periphery of the detection head 15B and the front end of the main shaft cylinder 41. The rotary transformer 48 has a primary side 48A located on the outer periphery of the main shaft tube 41 at the front end thereof, and a secondary side 48B located on the inner periphery of the main shaft cylinder 41 at the rear end of the detection head 15B. Are each fixed to the outer periphery?
(1) The secondary side 48B can be removed from the primary side 48A. The terminal 480 drawn out from the primary side 48A is connected to the controller 32 shown in FIG. The ports 807 and 807 are connected to each other.

, shi Also, in the second hole 46C, a sliding shaft 49 is provided.
is provided so as to be freely movable in the axial direction. At the front end of the sliding shaft 49, when the sliding shaft 49 moves to the right in the figure,
A collet chuck member 50 that clamps the locking portion 47A of the detection head 15B and pulls it to the right is integrally provided. Further, on the outer periphery of the front part of the sliding shaft 49, a strut horn'? −
A guide groove 52 for 5'l is formed with a predetermined length in the axial direction. Further, on the rear outer periphery of the sliding shaft 49, the fourth
A piston 53 is slidably provided in the hole 46E.
But nut't? Vist fixed by #4/5
3 shows the sring ring 5 inserted into the third hole 46D.
5 applies a force to the right in the figure. Therefore, since the sliding shaft 49 is normally moved to the right in the figure by the grip ring 55, the detection head 15B has a tip i9.
- The shank 47 is held in close contact with the first hole 46A.

Further, a motor mounting member 56 is provided at the rear end of the main shaft cylinder 41.
is fixed to the delt 57, and a spacer 58 and a bearing holding member 59 are attached to the delt 60.
Fixed by The bearing holding member 59 holds a thrust bearing sleeve 61 that faces the thrust bearing portion 43C formed at the rear end of the hydrostatic bearing sleeve 43 with a space therebetween. The compressed air supply port 62 attached to the bearing holding member 59 is supplied to the strike bearing cylinder 61: ・− ・・Parent) An air supply groove that blows out compressed air toward the front surface. 61
A is formed. On the other hand, a flange 46F is integrally formed at the rear end of the main shaft 15A and is slidably held between the thrust receiving portion 43C and the thrust bearing sleeve 61. A cover plate 63 that closes the rear end opening of the main shaft 15A is fixed to the flange 46F with bolts 64. The rear part of the sliding shaft 49 is slidably fitted into the cover plate 63 at the center. 1 large. A through hole 63A is formed, and a through hole 63A is formed. ', ;> Air supply for supplying compressed air supplied from the compressed air supply ports 66, 'H, 1...1r attached to the member 65 to the chamber 67 partitioned by the piston 53 and the cover plate 63. A groove 68 is formed. An output shaft 70 of a motor 69 fixed to the motor mounting member 56 is engaged with the rear part of the through hole 63A via a key 71.

Therefore, in the above structure, when the motor 69 is driven, its rotation is transmitted to the main shaft 15A1 through the cover plate 63, which causes the detection head 15B attached to the main shaft 15A to rotate. Also, the detection head 15
When removing B from the main shaft 15A, open the compressed air supply port 6.
When compressed air is supplied from the piston 6 to the chamber 67, the piston 53 moves to the left in the figure while compressing the snoring 55, and the sliding shaft 49 also moves in the same direction, causing the collet chuck member 50 at the tip to move. 77''''゛゜'''
"゜""Go to "゜''"It will be in a state where it can be removed from 5A. Conversely, when mounting the detection head 15B on the main shaft 15A, after inserting the teno G-shank 47 of the detection head 15B into the first hole 46A of the main shaft 15A,
When 7tl is reduced to zero, it becomes the compression force of Spunonog 55. ;・
", 11 The stone 53 moves to the right in the figure, and the companion shaft 49 also moves in the same direction. As a result, the two Yake members 50 grip the locking part 47A of the detection head 15B and pull it in. The detection head 15B is held by the main shaft 15A.

FIG. 3 shows a circuit for transmitting and receiving signals between the measurement control circuit 80 provided in the detection head 15B and the controller 32 shown in FIG. 1.

The command signal from the controller 32 is superimposed on the voltage supplied from the AC power supply 32C to the primary side 48A of the rotary transformer 48 via the transmitter 32A, and
It is applied to the measurement control circuit 80 via B. Furthermore, the measurement data signal from the measurement control circuit 80 is transmitted from the secondary side 48B to the primary side 48A of the rotary transformer 48, and is then received by the controller 32 via the receiving section 32B separated by capacitors 81A and 81B. be included.

The measurement 1 control circuit 80 outputs a command signal superimposed on the power supply voltage of the secondary side 48B of the rotary transformer 48 to a capacitor 80A. , 80B, an amplifier circuit 80D1 which amplifies the detection output (analog signal) given from the detection element 15C based on an instruction from the measurement command unit SOC.
Conversion circuit 80E1 converts the analog signal from D into a parallel digital signal. Parallel-serial conversion circuit 80F converts the digital signal from this h/b conversion circuit 80g into a series. Rotates the signal from this parallel-serial conversion circuit 80F. transformer 48
Frequency modulation circuit 8Q modulates the analog signal with a frequency higher than the power supply voltage of It is composed of a DC power supply unit 80H that supplies the circuit.Here, if the command signal given from the controller 32 specifies, for example, the dyne of the amplifier 80D, the measurement command unit 80C performs the measurement based on the command. The gain is selected from 1 to operate the amplifier 80D.In other words, it functions as a kind of r-in adjustment means.The detection element 15C shown in the figure is a detection element for roundness measurement, and An example is shown in which three electrical micrometers are arranged so as to occupy positions divided into three equal parts on the circumference.

Although not shown in the figure, the king axis 1. The rotation of the rotary drive system TB motor 69 and the movement of the measurement unit main body 11 in the x, y, and z axis directions are controlled by commands from the contourer 32.

Therefore, in the embodiment described above, the command signal given from the controller 32 to the detection head 15B and the measurement data signal given from the detection head 15B to the controller 32 are exchanged via the rotary transformer 48. It is no longer necessary to provide these signal transmission means inside the main shaft 15A as in the past, and as a result, processing is easy, and the main shaft 15A can be used only for power transmission, which is advantageous in terms of strength. Become.

・゛, In the above embodiment, the detection head 15B and the controller 1
-"Sends and receives signals to and from the detection head 15B;.
m'. This is done by using the rotary transformer 48 that supplies power to the measurement control circuit 80 provided in the detection head 15B. Since the rotating transformer 48 is not required, a non-contact signal receiving means consisting of a light emitting element and a light receiving element is used.

In this case, regarding the transmission of the command signal given from the controller 32 to the detection head 15B, the detection head 15B
A light emitting element is disposed on the main shaft cylinder 41 facing the outer peripheral surface of the controller 32, and a plurality of light receiving elements are disposed all around the circumference of the head 15B facing the light emitting element.
The configuration is such that a command signal from a plurality of light receiving elements is detected by one of the plurality of light receiving elements via a light emitting element. On the other hand, regarding the transmission of the measurement data signal given from the detection head 15B to the controller 32, contrary to the above, the detection head 15B
It is sufficient to arrange one light-emitting element on the B side and a plurality of light-receiving elements around the entire circumference of the main shaft cylinder j1. It is set up in parallel.

In addition, the arrangement of the light-emitting element and the light-receiving element is as follows:
The cases shown in FIGS. 4 to 6 may also be used. this is,
Light-receiving element groups 91A and 91B each consisting of a plurality of light-receiving elements that receive command signals from the controller 32 are arranged on the detection head 15B side at intervals of 180 degrees, and each of the light-receiving element groups 91A. A plurality of light emitting elements 92A to 92F are arranged on the main shaft cylinder 41 side for each angle occupied by 91B. on the other hand,
Light-receiving element groups 93A and 93B that receive measurement data signals from the detection head 15B are arranged on the main shaft cylinder 41 side at intervals of 180 degrees, and a plurality of light-emitting elements 94A to 94B are arranged for each angle occupied by each of the light-receiving elements 93A and 93B. 94F is placed on the detection head 15B side. This has the effect that the number of light receiving elements can be reduced compared to arranging light receiving elements all around the circumference. In this case, the signals are exchanged at appropriate timing.

Furthermore, as shown in FIGS. 7 and 8, for example, one light emitting element 95 is disposed on the side of the detection tube 15B, and one set of light receiving elements 96 is arranged on the main shaft cylinder 41 side, and the green light element serves as the light receiving element. If a means (such as a rotary encoder) is provided to detect the timing when the group 96 faces the group 96, it is possible to have the same effect as described above. Although the explanation has been made regarding the transmission and reception of the command signals, the configuration is reversed regarding the command signals from the controller 32.

2) According to the present invention as explained above, there is no need for machining of the transmitting means inside the main shaft cylinder, so it is possible to solve the problems of lower workability and mechanical strength associated with this. Therefore, it is possible to provide a signal transmission device that maintains mechanical precision and ensures reliable signal transmission.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an overview of the entire measuring unit device to which the present invention is applied, Fig. 2 is a sectional view of the main shaft showing an embodiment of the signal transmission device of the present invention, and Fig. 3 is a block diagram thereof. , FIG. 4 is a sectional view of the principal part of the main shaft showing another embodiment of the signal transmission device of the present invention, and stripe 5 is a sectional view taken along the line ■-v in FIG.
Fig. 6 is a sectional view taken along the line 4-〇■, and Fig. 7 is a sectional view of the principal part of the main shaft showing still another embodiment of the signal transmission device of the present invention.
FIG. 8 is the time chart. 15A...Main shaft, 15B...Detection head, 15C...
...detection element, 32...controller, 41...main shaft cylinder, 4B...rotary transformer, 48A...primary side of rotary transformer, 48B...secondary side of rotary transformer. ，
91A, IB, 93A193B, 96... light receiving element,
92A-92F4A-94F, 95... Light emitting element. −2, Patent applicant Seiichi Ishizaka, Director General of the Agency of Industrial Science and Technology −
299--300■

Claims (2)

[Claims] (1) A main shaft cylinder, a main shaft that is rotatably housed in the main shaft cylinder and removably supports a detection head that includes a detection element for measurement at the tip, and A control unit that gives a command signal and receives measurement data signals from the detection head, and a non-contact signal exchange means that is provided outside the main shaft cylinder and exchanges signals between the control unit and the detection head. A signal transmission device for measuring a machined article, characterized by comprising: (2) In claim 1, the non-contact signal transmitting/receiving means is mounted with a primary side facing the outside of the main shaft cylinder and a secondary side facing the detection head, and the primary side and the secondary side facing each other. The machining process is characterized in that the rotary transformer is configured such that a signal between the control unit and the detection head is superimposed on the power supply voltage supplied to the detection head via the next side. Signal transmission device for measuring articles. (3) In claim 1, the non-contact
} j) The tactile type signal transmitting/receiving means includes a light emitting element provided on one of the main shaft cylinder and the detection head, and a light emitting element provided on the other of the main shaft cylinder and the detection head, facing the light emitting element. 1. A signal transmission device for measuring a machined article, comprising a light receiving element.