JPH0546840Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial application field This invention relates to a workpiece identification device that identifies the workpieces using a workholder that attaches and transports the workpieces when machining many types of workpieces with a machine tool such as a machining center. .

(2) Conventional technology An example of a line with a conventional system configuration is FMS.
A single machine tool is required to process many types of workpieces on a production line. In this case, when differentiating the various workpieces carried into the machine tool, a predetermined perforation card is attached to the rectangular pallet when the workpiece is placed, read in advance by a detection means such as a proximity switch, and discriminated. transported to the machine.

(3) Problems to be solved by the invention However, in order to distinguish the type of workpiece using the perforated card attached to the rectangular pallet according to the above-mentioned conventional technology, it is difficult to distinguish between many types of workpieces due to the space limitations of the card mounting surface. There are limits to what you can do.

(4) Purpose The purpose of this invention was proposed in order to solve the problem in view of the above circumstances, and to make it possible to easily identify the types of workpieces and to identify a larger number of workpiece types than before by combining binary codes. The object of the present invention is to provide a workpiece identification device.

(5) Means and effects for solving the problem In order to achieve the above-mentioned object, the present invention provides a spindle that is rotatably supported in a housing and has a tool mounting part at the tip to which a tool can be attached and removed; In an NC machine tool having a table that is arranged to face each other and that moves relatively in the axial direction of the main spindle and in a direction orthogonal to the axis, the NC machine tool is placed on the table and moves around an axis parallel to the top surface of the table. An indexing device having an indexing main shaft that can be rotated and indexed and has a workpiece mounting portion formed at its tip; a workpiece mounting member having a shank portion mounted on the workpiece mounting portion; an attached disk-shaped plate; a first detection object detachably provided on the outer periphery of the disk-shaped plate for identifying the workpiece process; , a plurality of second detected objects are detachably provided at predetermined angles, either continuously or interleaved with the first detected object, and are used to identify the workpiece type; After being mounted on the main shaft of a machine tool and positioned at a predetermined position by relative movement between the main shaft and the table, when the indexing device performs an indexing operation at predetermined angle intervals from the base point, the first target a detection means for detecting the presence or absence of contact with a detection object and a second detection object; The present invention is configured to include an identification control device that replaces presence/absence with a binary code, converts this binary code into a decimal code, and specifies the machining program number by identifying the process information and workpiece number of the workpiece.

A detection means is brought into contact or non-contact with each of the detecting bodies, for example, by a touch sensor inserted into the main shaft, and an identification signal of the workpiece is extracted to identify the workpiece. As a result, it is possible to identify more workpieces than with conventional workpiece identification devices, and workpiece management becomes more accurate.

(6) Example Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

(a) First, work transport using a work holder to which the work identification device of the present invention is attached will be explained.

3A is a plan view of the machine tool with the pool line 1 provided on the front side, and FIG. 3B is a side view of FIG. 3A. In A and B of FIG. 3, position A of the pool line 1 is a workpiece exchange position, and a device (not shown) for attaching and removing a workpiece is arranged. Four disc-shaped cassette tables 4 are placed on a rotating unit 2 constituting the pool line 1, and are rotated by a drive device (not shown) by a rotating shaft 3 in the center. Further, the cassette table 4 on the rotating unit 2 is rotated independently of the rotating unit 2 by a drive device (not shown). The details of this rotating unit are disclosed in Japanese Patent Application No. 115070/1989 filed by the same applicant. Ten works W are stored in each of the four cassette tables 4 by work holders having the identification device of the present invention. Therefore, 40 workpieces W are stored on the pool line 1 constituted by this rotating unit. Position B of the cassette table 4 is the delivery position of the workpiece W, and this position B
Then, the replacement workpiece is indexed by rotating the cassette table 4.

A loader 6 for transporting the workpiece W on the pool line 1 is disposed beside the transfer port B, and a table 7 on which the workpiece W of a machine tool (machining center) is placed is placed on the left side of the loader 6. It is mounted for axial movement. Therefore, the workpiece W is gripped by the loader 6 at the delivery port, and the loader arm is rotated 180° so that the workpiece main shaft of the indexing device T placed on the table 7
Sp ₂ is transported with the work holder attached.

Furthermore, a column 8 of a machining center, which is a machine tool that processes the workpiece W, is slid in the Z-axis direction, and a spindle head 9 attached to the front surface of the column 8 is slid in the Y-axis direction by a Y-axis servo motor 10.
A tool magazine 11 is attached to the side of the column 8, and a large number of necessary tools 12 are stored in the tool magazine 11.

The tool 12 is exchanged between the tool magazine 11 and the spindle of the spindle head 9 by a tool exchanger 13 as necessary.

The machining center is operated by the main operation panel, and the tool 1 attached to the spindle of the spindle head 9 is operated by the main operation panel.
2, the work W inserted into the index stand on the table 7 is processed.

(b) The structure of the work identification device, which is the main part of the present invention, will be explained.

A in FIG. 1 is a longitudinal cross-sectional view of a work holder to which the work identification device of the present invention is attached, and B in FIG. 1 is a view taken along the - line in FIG. 1A.

In A and B of FIG. 1, the work holder 100 consists of a gripper part 101, a tapered shank part 102, and a disc-shaped plate 103.

A pull stud 104 is attached to the rear of the work holder 100 for inserting and locking the work holder itself. The gripper part 101 and the disc-shaped plate 103 are screwed together by four bolts 105 and 106 to be integrated.

Further, the workpiece W is fitted into a protrusion 107 protruding from the central front part of the workpiece holder 100 and is screwed with a bolt 108. Note that the workpiece W up to the size indicated by the two-dot chain line can be placed in the workholder 1.
Attached to 00.

A large number of workpiece identification dots, for example, five workpiece identification dots 109a to 109e, are attached to the outer periphery of the disc-shaped plate 103 at intervals of 10 degrees. Work holder 1
The workpiece is identified by detecting the workpiece identification dots 109a to 109e using, for example, a touch sensor attached to the main shaft, only by turning 00 in a fixed direction from the reference point.

(c) A state in which the work holder to which the work identification device of the present invention is attached is inserted into the indexing device T on the table 7 and the work is identified will be explained with reference to FIG.

FIG. 2 is a plan view of the state in which the work holder is inserted onto the indexing table in A of FIG. 1.

In FIG. 2, a touch sensor Ts is inserted into the spindle Sp ₁ of the spindle head 9. A workpiece spindle Sp ₂ on which the workpiece holder 100 is inserted into the indexing device T placed on the table 7 is rotatably supported by the headstock 110 so as to be indexable. The headstock 110 includes:
A drive unit that rotates the work holder 100 is provided. The headstock 110 is composed of a servo motor 111, a motor output shaft 112, a worm 113, a worm wheel 114, and a bearing 115.
from the worm 11 via the motor output shaft 112
Since the worm 113 and the worm wheel 114 are meshed with each other, the rotation is transmitted to the worm wheel 114. Therefore, since the work holder 100 inserted into the work spindle is rotated by the worm wheel 114, the work holder 100 is rotationally indexed at constant angle intervals, and each dock 109a to 109a is rotated by the worm wheel 114.
The touch sensor Ts is brought into contact with 109e to identify the workpiece.

Next, the flow of signals related to workpiece identification will be explained using a block diagram in FIG. 4A. In order to identify the workpiece inserted into the main shaft Sp ₂ of the indexing device T, the identification dots 109a to 109e provided on the outer periphery of the work holder come into contact with the touch sensor Ts inserted into the main shaft on the machine side. The pulse signal Pw corresponding to the workpiece number is taken out from the machine side, and the following processing is performed within the NC device. A pulse signal Ps every 10 degrees is taken out from the pulse generator P at the rear end of the main shaft Sp ₂ of the indexing device T.
Pulse signal Pw and pulse signal Ps for each workpiece taken from the machine side by touch sensor Ts
The respective signals are synthesized by a signal synthesis circuit 20. In addition, the work number input from the input circuit 21 in advance is also included.
is stored in the work number memory 22. Then, the signal synthesized by the signal synthesis circuit 20 is taken into the discrimination circuit 23, and the work number in the work number memory 22 is discriminated. As a result of this determination, O is the machining program number corresponding to the workpiece number.
No. is given to the output circuit 24, and the output circuit 24
is output as processing information.

Next, the operation of the present invention will be explained based on the flowchart shown in FIG. 4B.

In Figure 4 B, start machining and
First, a workpiece is brought in by a robot at stage A. Next, in stage B, the work identification device of the present invention is operated. Perform an initial reset in the second stage. That is, in order to perform an initial reset, the tool correction is canceled, the fixed cycle of the G code is canceled, and the coolant of the M code is stopped, thereby returning the machine to a safe state. After performing an initial reset in the first stage, the G code is saved in the second stage. The current code of the modal G code used for work identification is saved in a variable. For example, G00 | G01, G02, G03, G01,
(Rapid feed) (Cutting feed) (Circular feed) Save either G02 or G03. Furthermore, G91 (absolute), G90
(Incremental) Save one.

After the touch sensor is called out from the tool storage magazine in the first stage, the A axis of the table (work main axis Sp ₂ ) is set at the original position for work discrimination in the second stage. (Return the position of the work holder to the reference position.) That is, the dock of the work holder attached to the work spindle Sp ₂ of the indexing device on the table is brought to its original position. In the second step, the position from the machine origin to the discrimination pin is set as a variable, and thereafter the touch sensor is moved based on this data.

In the second step, the current position is read and the distance from the origin to the current machine position is set in a variable.

Next, in the second stage, positioning is performed from the current machine position to the X and Y positions of the discrimination pin. In the second stage, the touch sensor attached to the main shaft is moved in the Z-axis direction and brought into contact with the dock of the work holder.

In the first stage, it is determined whether the process is the first process or the second process based on the presence or absence of a process determination pin. The data of the first process and the second process discriminated by the discrimination pin in the ninth stage are stored as program numbers in variables in the respective stages, and are used when calculating the program number. For example, first step #33=0, second step #33=
Register 1000.

In the second stage, the work type identification is repeated up to 6 times. If it goes beyond that, move on to another flow.

In the first stage, the A axis is indexed by 10 degrees, and in the second stage, the touch sensor is moved in the Z axis direction so as to come into contact with the dog of the work holder.

In the first stage, the presence or absence of the workpiece type identification pin is determined, and in the second stage, the presence or absence of the touch in the first stage is replaced with "1" and "0", and a match with the workpiece number is determined by a combination of binary codes arranged in the order of identification. Count to see. In the step, the number of identifications is increased one by one and the process returns to the step.

When the number of touches reaches 6 or more in the first stage, the process proceeds to the second stage and the machine is returned to its original position.
In the second stage, the G code saved in the first stage is reproduced.

In the second stage, the binary code obtained by workpiece type identification is calculated into a decimal code, and the process discrimination data (1 process = 0 , 2 processes = 1000) and work number (1
Steps 10 to 310 and 2 steps 1010 to 1310) are determined.

In the second step, it is determined whether the number is within the range, and if it is within the range, the process returns to the main program, and if it is outside the range, it is judged as abnormal and the process runs to the workpiece unloading program.

As described above, when the workpiece discrimination is completed, the machining program is called at the stage and the machining is performed at the stage. In the stages, work check is performed at stage ○A, centering is performed at stage ○B, circular cutting is performed at stage ○C, automatic correction is performed at stage ○2, boss centering is performed at stage ○H, and centering is performed at stage F. Perform hole drilling.

When machining is completed at the stage, the workpiece is carried out at the stage to confirm that all machining has been completed at the stage, and then all machining is completed.

(7) Effects The present invention has a plurality of detection objects arranged around the outer periphery of the workpiece mounting disk-shaped plate of a work holder having a taper shank, so that the detection means can detect the detection objects only by turning in a fixed direction from a reference point. This makes it possible to identify many more workpieces than before. Therefore, work management becomes easy.

Furthermore, in addition to workpiece identification, it is possible to transmit various types of information such as processing information and process control information by using the identification device of the present invention.

[Brief explanation of the drawing]

Figure 1A is a vertical sectional view of the work holder to which the workpiece identification device of the present invention is attached, and Figure 1B is the first
It is a - line arrow view of figure A. FIG. 2 is a plan view of the state in which the work holder is inserted onto the indexing table in FIG. 1A. 3A is a plan view of a machine tool with a pool line provided on the front side, and FIG. 3B is a side view of FIG. 3A. FIG. 4A is a block diagram illustrating the flow of the work identification signal, and FIG. 4B is a flowchart illustrating the operation of the present invention. 1...pool line, 2...swivel unit, 4
... Cassette table, 6 ... Loader, 9 ... Headstock, 100 ... Work holder, 101 ... Gripper section, 103 ... Disc-shaped plate, 104 ...
...Pre-stad, 109a to 109c...Work identification dock, 110...Spindle stock, Sp ₂ ...Spindle,
Ts...touch sensor, T...indexing device, W...
…work.

Claims (1)

[Claims for Utility Model Registration] A main shaft that is rotatably supported by a housing and has a tool mounting part at the tip to which a tool can be attached and removed, and a main shaft that is provided to face the main shaft and that An NC machine tool having a table that moves relatively in orthogonal directions, which is placed on the table, is rotatable and indexable around an axis parallel to the top surface of the table, and has a workpiece mounting part formed at the tip. an indexing device having an indexing main shaft; a workpiece mounting member having a shank portion mounted on the workpiece mounting portion; a disc-shaped plate mounted on the workpiece mounting member; and an outer peripheral portion of the disc-shaped plate. a first detected object that is removably provided and is used to determine the process of a workpiece; A plurality of detectable objects are detachably provided at predetermined angles in an interlaced state, and are used to identify the type of work. After being positioned at a predetermined position by relative movement, when the indexing device performs an indexing operation at predetermined angle intervals from a base point, detecting the presence or absence of contact with the first detected object and the second detected object. a detection means for detecting the presence or absence of the first detected object and the second detected object at each predetermined angle detected by the detection means, and converting the binary code into a decimal code; , an identification control device that identifies a machining program number by identifying the process information and work number of the work, and a detection means mounted on the tool spindle to index the detected object of the work mounting member in one direction. A workpiece identification device characterized by identifying a workpiece only by motion.