JPS6228325Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention is a perforated plate in which a perforated plate having a large number of circular holes on its circumference is rotated and indexed about its central axis to process the circular holes. Regarding processing equipment.

<Prior art> Fig. 1 shows a perforated plate W in which a large number of circular holes Wa are formed at equal pitches on the circumference around a central axis, and a central hole Wb is formed in the center. In such a perforated plate W, the circular holes
In order to process the inner peripheral surface of Wa with high precision, first
The circular hole Wa is rough-machined using a drill at the machining position, and then finishing machining is performed using a boring tool at the second machining position.

However, when processing the perforated plate W in two steps as described above, the perforated plate W is moved from the first processing position to the second processing position, so a phase shift occurs in the perforated plate W during transportation, and the circular There were problems in that the hole Wa was machined with a deviation in the circumferential direction, and that the cutting allowance became large and a large load was applied to the tool, causing damage to the tool.

<Purpose of the invention> The present invention was made in order to eliminate such drawbacks of the conventional method, and its purpose is to align the circular hole with the center of the tool before machining the circular hole. The purpose is to accurately machine the circular hole at a predetermined angle and to prevent damage to the tool.

<Structure of the invention> The present invention has been made to achieve the above object, and includes a rotary indexing device that rotates and indexes a perforated plate so that the circular holes of the perforated plate correspond to tools sequentially, and A contact detection head that detects contact with a peripheral surface, and a control device that controls the rotary indexing device based on a signal from the contact detection head to center the center axis of the circular hole on the tool center axis. The present invention relates to a perforated plate processing apparatus having the following structural features.

<Examples> Examples of the present invention will be described below based on the drawings. In FIG. 1, 10 is a bed, and a support stand 11 is fixed on this bed 10. A slide table 12 is slidably mounted on the support table 11 and is moved in the Y-axis direction by a servo motor M _Y. A tool stand 13 is fixed on the slide stand 12, and this tool stand 13 has a tool shaft 1 with a boring tool T attached to its tip.
4 is rotatably supported on a shaft and is further rotationally driven by a main shaft drive motor 15.

A fixing base 18 is further fixed on the bed 10. A movable table 19 is slidably placed on the fixed table 18, and is moved in the X-axis direction perpendicular to the Y-axis by a servo motor _M.sub.X. A headstock 20 is fixed on the movable base 19, and a rotating main shaft 21 is rotatably supported on the headstock 20.

The rotation main shaft 21 is connected to a rotation indexing device 22 as shown in FIG. This rotary indexing device 22 includes a worm wheel 23 wedged at the center of the rotating main shaft 21, a worm 24 meshing with the worm wheel 23, and an indexing servo motor M _C (see Fig. 2) that rotates the worm 24. )
The rotary main shaft 21 is configured to rotate and index the rotational main shaft 21.

Further, an angular phase detection device 26 is provided at the retreating portion of the rotation main shaft 21. This angle transfer detection device 26 includes a magnetic scale 28 attached to the rear end of the rotating main shaft 21 and a sensor 29 fixed to the headstock 20, and the output from this sensor 29 is counted by a measurement counter KC, which will be described later. By doing so, the rotation angle phase of the rotating main shaft 21 is detected.

Furthermore, a chuck 30 is fixed to the front end of the main rotating shaft 21 for positioning and clamping the perforated plate W so that its central axis coincides with the axis of the main rotating shaft 21. This chuck 30 has a chuck main body 31 having a well-known hydraulic mandrel built therein, and expands the expansion sleeve 33 by pressing a pressing pin 32 protruding from the chuck main body 31 with a push rod 53 to be described later. It is expanded outward to grip the center hole Wb of the perforated plate W.

An operating rod 34 is inserted through the center of the chuck body 31, and a block 36 is attached to the tip of the operating rod 34. This block 3
At 6, a clamp claw 40 for pressing and clamping the perforated plate W onto the support metal 39 is pivotally supported by a pivot pin 38. Also, this pivot pin 38
An engaging member 43 that engages with a cam ring 42 fixed to the front surface of the chuck body 31 is fixed to the chuck body 31. This engaging member 43 shifts its engagement point from the tapered cam surface of the cam ring 42 to the cylindrical cam surface as the operating rod 34 moves backward, and the engaging member 43 moves into a cylindrical cam surface due to the forward movement of the operating rod 34. The engagement point is shifted from the shaped cam surface to the tapered cam surface, and the clamp pawl 40 fixed coaxially with the engagement member 43 is provided with an opening/closing motion.

Note that 45 is a spring that applies a repulsive force in the closing direction to the clamp claw 40, and 48 is an operating cylinder that opens and closes the clamp claw 40. A piston 49 fitted in this operating cylinder 48 and the operating rod 34 are connected. Reference numeral 51 denotes a pressing cylinder that presses the pressing pin 32, and a piston 52 fitted into the pressing cylinder 51 and the push rod 53 are connected.

On the other hand, the slide table 12 has a contact detection head 60 as shown in FIG.
An actuating device 70 is provided for making a pivoting movement.

The contact detection head 60 has a built-in well-known detection mechanism that turns on and off the current according to the displacement of the feeler 61. For example, the contact detection head 60 has a built-in detection mechanism that turns the current on and off according to the displacement of the feeler 61. When they come into contact, the current is turned on and off due to the displacement of the feeler 61 due to this contact, and the feeler 61 and the circular hole
Contact with the inner peripheral surface of Wa can be detected.

The actuating device 70 also includes a mounting base 71, a swing plate 73 that supports the contact detection head 60, which is supported on the mounting base 71 so as to be pivotable about a pivot shaft 72,
a rotation cylinder 74 that rotates around 2;
A piston 75 fitted into this rotating cylinder 74
It is composed of a rack 76 and a pinion 77 that transmit the motion of
By activating this actuating device 70, the contact detection head 60 detects the circular hole Wa of the perforated plate W.
Detection position Pl (4th
The turning operation is performed between the position shown by the imaginary line in the figure) and the detachment position Pr (the position shown by the solid line in Fig. 4), which is separated from the circular hole Wa which is deviated from the tool axis axis.

FIG. 5 shows a numerical control device 80 for controlling the operation of the processing device, which is composed of an arithmetic processing device 81 consisting of a microcomputer and a memory 82. In this memory 82, the porous plate W
A program necessary for centering the circular hole Wa and a program necessary for machining the circular hole Wa are stored, and the arithmetic processing unit 81 sequentially reads out this control program and executes the control program via the drive unit 75 based on this control program. Servo motor _M
It is now possible to administer positive and negative command pulses to the servo motor M _Y and the indexing servo motor M _C , and to output various operation commands to the relay circuit 84 that controls sequence operations via the interface 83. ing.

The operation of this processing device will be explained below.

First, when the command switch is pressed at the same time as the start of operation, the arithmetic processing unit 81 reads the program shown in step 90 and outputs a command to carry in the perforated plate W. This command activates an unillustrated transport device,
As a result, the perforated plate W, which has already had the circular holes Wa drilled in the previous step, is carried in from the direction of arrow _A1 and positioned at the carry-in/out position _P1 shown in FIG.

Thereafter, the arithmetic processing unit 81 executes step 91, whereby the arithmetic processing unit 81 sends a predetermined pulse to the servo motor _Mx , and as a result, the movable table 19 is moved forward in the X direction. At this time, the clamp claw 40 is closed, and the clamp claw 40 is inserted into the center hole of the perforated plate W positioned at the loading/unloading position _P1 .
It passes through Wb and is located in front of it. Subsequently, in step 92, a clamp command is output, and as a result, the operating cylinder 48 and the pressing cylinder 51 are operated, the expansion sleeve 33 grips the inner diameter of the perforated plate W, and then the clamp claw 40 clamps the perforated plate W to the support metal 3.
9 and clamp it.

At the same time as the clamping of the perforated plate W is completed, step 93
In step 93, centering work for the circular hole Wa is started based on the routine shown in FIG. That is, at the same time as step 92 is completed, the process proceeds to step 193, where a rotation command for the contact detection head 60 is output, and as a result, the actuating device 70 is actuated.
Contact detection head 60 located at detached position Pr
is rotated to the detection position Pl, followed by step 1
In 94, the arithmetic processing unit 81 is a servo motor _M
The movable table 19 is moved forward by sending out a pulse, and as a result, the perforated plate W held by the rotating main shaft 21 is moved forward from the loading/unloading position _P1 to the centering position _P2 , and at the centering position _P2 . The feeler 61 of the contact detection head 60 is inserted into the circular hole Wa.

Next, in step 195, a negative pulse is sent to the indexing servo motor M _C , and as a result, the rotation main shaft 2 is transmitted via the worm 24 and the worm wheel 23.
1 is indexed and rotated. As a result, the rotating main shaft 21
The perforated plate W clamped to the front end of the eighth
As shown in the figure, the filler 61 is rotated clockwise, and in step 196 it is determined whether or not the feeler 61 has contacted the inner circumferential surface of the circular hole Wa. If contact is detected, the process proceeds to step 197. In this step 197, a positive pulse is sent to the indexing servo motor M _C , and as a result, the rotating main shaft 21 is indexed and rotated in the opposite direction. As a result, the perforated plate W becomes the sixth
In the figure, it is rotated counterclockwise, and at the same time, in step 198, the output from the sensor 29 at that time is measured as the amount of movement of the perforated plate W by the measurement counter KC.
It is counted by. Following this step 1
99, it is determined whether or not the feeler 61 has contacted the circular hole Wa, and if contact is detected,
Proceeding to step 200, arithmetic processing is executed to halve the content of the measurement counter KC at the moment of contact.

Thereafter, in step 201, a pulse is applied to the indexing servo motor M _C to move the perforated plate W into the sixth position.
Rotate it back clockwise in the figure. At this time, the amount of movement of the perforated plate W is controlled so that the output from the sensor 29 matches the calculation result KC/2, and as a result, the center of the circular hole Wa matches the center of the contact detection head 60 with high precision. be done. Subsequently, in step 202, a pulse is sent to the servo motor _MX to move the movable table 19 backward, and as a result, the perforated plate W moves from the centering position _P2 to the loading/unloading position _P1 .
Also, the feeler 61 escapes from the circular hole Wa. Thereafter, in step 203, a rotation command for the contact detection head 60 is output, whereby the contact detection head 60 located at the detection position Pl is rotated to the detachment position Pr.

By executing the above routine, the misalignment is corrected so that the center of the circular hole Wa coincides with the center of the contact detection head 60, that is, the tool axis, and the process returns to step 94 shown in FIG. 6 again. In this step 94, a pulse is applied to the servo motor M _X to advance the movable table 19, and as a result, the perforated plate W is advanced from the loading/unloading position _P1 to the processing position _P3 , where it was roughly machined in the previous process. The circular hole Wa is finished by the tool T. At this time, the center axis of the circular hole Wa is aligned with the tool axis with high precision, so there will be no problems such as the circular hole Wa being machined out of alignment or the tool T being damaged due to excessive load. .

Upon completion of machining, the process moves to step 95. In this step 95, a pulse is applied to the servo motor M _X to retract the movable table 19, and as a result, the perforated plate W is retracted from the processing position _P3 to the retracted position _P4 , and the circular hole is retracted.
Tool T is pulled out from Wa. Next, in step 96, it is determined whether or not the circular hole Wa is the Nth one. If the required number of circular holes Wa have not yet been machined, the process proceeds to step 97, where an indexing command for the perforated plate W is issued. is output. As a result, a pulse is sent to the indexing servo motor M _C , and as a result, the perforated plate W is indexed and rotated by a predetermined angle together with the rotating main shaft 21, so that the next circular hole Wa is opposed to the tool T.
Steps 94 to 96 are repeated again from this state, and the necessary number of circular holes Wa are machined.

When it is determined in step 96 that the Nth machining has been completed while the above machining is being repeated, the process advances to step 98. In this step, a pulse is applied to the servo motor _MX to retract the movable table 19, and as a result, the perforated plate W is retracted from the retracted position _P4 to the loading/unloading position _P1 . Subsequently, in step 99, an unclamp command is output, whereby the operating cylinder 48 and the pressing cylinder 51 are operated, and the expansion sleeve 33 and clamp claw 40 unclamp the perforated plate W. At the same time as the perforated plate W is unclamped, a pulse is applied to the servo motor _Mx in step 100, and as a result, the movable table 19 is retreated in the X direction. At this time, since the chuck 30 is in an unclamped state, it retreats while leaving the perforated plate W at the loading/unloading position _P1 . Subsequently, in step 101, a transport device (not shown) is operated, and the transport device is moved to the loading/unloading position _P1.
The perforated plate W placed in is carried out in the direction of arrow A.

In addition, when processing the perforated plate W in which the center-to-center distances of the circular holes Wa are different in the above embodiment, this can be easily handled by sliding the slide table 12 using the servo motor _MY .

<Effects of the invention> As described above, the apparatus of the present invention includes a contact detection head inserted into a circular hole of a perforated plate prior to machining the circular hole, and a contact detection head that rotates and indexes the perforated plate to perform the contact detection. The structure includes a rotary indexing device that brings the feeler of the head into contact with the circular hole, and a control device that controls the rotary indexing device from a signal from the contact detection head, so that the center of the circular hole is located at the contact detection head. The center of the tool can be aligned with the center line of the tool axis with high precision.
It also has the advantage of eliminating the problem of damage to the tool due to excessive load acting on the tool.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a plan view of a perforated plate, Fig. 2 is a plan view of the device of the present invention,
Fig. 3 is a sectional view taken along the - line in Fig. 2, Fig. 4 is a partial plan sectional view of Fig. 2 showing the relationship between the perforated plate, the tool, and the contact detection head, and Fig. 5 shows the numerical control device. 6 and 7 are flowcharts showing the operation of the arithmetic processing unit, and FIG. 8 is an operation explanatory diagram showing the centering operation. 10... Bed, 13... Tool rest, 14... Tool shaft, 20... Headstock, 21... Rotating main shaft, 22
...Rotary indexing device, 30...Chick, 60...
...Contact detection head, 70... Actuation device, W... Perforated plate, Wa... Circular hole, T... Tool.

Claims (1)

[Scope of utility model registration request] A bed, a tool rest provided on the bed, a tool shaft rotatably supported on the tool rest and having a tool attached to its tip, a head stock provided on the bed, and a tool rest mounted on the head stock. On the other hand, a rotating main shaft supported rotatably about an axis parallel to the tool axis axis and a perforated plate having a large number of circular holes on the circumference are positioned so that their central axes coincide with the rotating main shaft. a chuck attached to the tip of the rotating main shaft to hold it; a feeding device for relatively moving the perforated plate forward and backward in the axial direction of the rotating main shaft together with the chuck; and rotationally indexing the perforated plate together with the chuck about the rotating main shaft axis. a rotary indexing device that detects contact with the inner circumferential surface of the circular hole of the perforated plate, a contact detection head that detects contact with the inner circumferential surface of the circular hole of the perforated plate, and a detection position on the tool axis axis at which the contact detection head is inserted into the circular hole of the perforated plate. and an actuating device for retracting the rotary indexing device between the center and a detachment position of the circular hole which is off the axis of the tool axis, and a signal from the contact detection head to drive the rotary indexing device to align the center of the circular hole with the center of the tool. A perforated plate processing device characterized by comprising a control device for producing a perforated plate.