JPH0236041A - Control device for work loading of machine tool - Google Patents

Abstract

PURPOSE:To perform a seating operation once again and to substantially improve the operation rate of an unmanned running by shunting a work once by a loader when a setting failure is detected and controlling so as to air-blow the seating face of a chuck. CONSTITUTION:Whether or not a work is normally seated is decided by detecting the air pressure by feeding air to the air discharging port 30 of main shaft chucks 1, 2, after the work being transferred to the main shaft chucks 1, 2 from a loader chuck 16. The air pressure becomes less than the specified in case of the abnormality, a seating NG is decided by a seating deciding means, the work is separated from the main shaft chucks 1, 2 by regripping it by the loader chuck 16 once again, in case of its being less than a 5th times, for instance, and it is seated again by air-blowing the seating surface with opening and closing the main shaft chucks 1, 2. When the seating NG is decided even in case of the 4th try, the possibility due to other causes but chips seems high, so the running of a machine is stopped and an alarm lamp is lit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a work loading control device for controlling automatic loading of a workpiece in a machine tool such as a lathe having a loader.

[Conventional technology]

For example, a large automatic lathe is provided with a loader for loading and unloading a workpiece onto a spindle chuck. This loader takes in the work material from the material shooter,
This is attached to the spindle chuck of a lathe, and after machining is completed, the machined workpiece is removed from the chuck and the chuck is transferred to a chute for ejecting the workpiece.

Furthermore, an automatic lathe that has a reversing device together with the loader is also provided (see Japanese Patent Application Laid-Open No. 58-206303).9 In such a device, after machining one side of the workpiece is completed, the workpiece is It is attached to a reversing device, and the workpiece is reversed here.

Then, this inverted workpiece is mounted on the chuck again by the loader. This makes it possible to process both sides of a workpiece with one machine and one spindle.

[Problem to be solved by the invention]

Incidentally, in the above-mentioned apparatus, a mechanism is provided for checking whether or not the workpiece is properly seated on the seating surface of the spindle chuck when the workpiece is mounted on the spindle chuck by the loader. For example, an air discharge hole is provided on the seating surface of the spindle chuck, and after the workpiece is mounted on the chuck,
Air is discharged from the air discharge hole, and it is determined whether or not the seat has been properly seated based on air leakage (air pressure detection).

When such a seating determination means determines that the workpiece is not seated normally (hereinafter referred to as seating NG), the automatic operation cycle is stopped and an alarm etc. is issued.

However, in conventional devices, the seating failure occurs frequently, and each time an operator investigates the cause and restarts operation of the machine. For example, if this seating failure occurs during the first cycle of unmanned operation at night, the operation will be stopped at that point, and no machining will be performed until morning. Therefore, in conventional equipment,
There was a problem that unmanned driving could not be performed smoothly.

The present invention has been made in view of the above problems, and provides a work loading control device for a machine tool that can perform the seating operation again even if seating fails, and can significantly improve the operating rate of unmanned operation, especially at night. The purpose is to

[Means to solve the problem]

By the way, the applicant investigated the causes of the above-mentioned seating failure and found that (1) the workpiece is not being shaved properly due to wear of the chip, etc., (2) chips are present between the workpiece and the seating surface. It has been found that the following is the case in most cases when the seat cannot be properly seated due to entanglement, and that the probability of occurrence of seating failure is particularly high due to the cause (2) above.

Therefore, the work loading control device for a machine tool according to the present invention includes: seating determination means for determining the seating state of the workpiece; blowing means for blowing air against the seating surface of the chuck;
The apparatus further includes a control means for controlling the loader and the blowing means when the seating determination means detects seating failure.

When it is determined that the seating is NG, the control means controls the loader so that the loader grasps the workpiece and temporarily retreats, and controls the blowing means so that the seating surface of the chuck is blown with air after the loader retreats. It is something to control.

[Effect]

In this invention, when it is determined that the workpiece cannot be seated, the workpiece is gripped by the loader again and temporarily evacuated. After the seating surface is blown with air, the work is again seated on the chuck by the loader, and a seating check is performed.

By repeating such operations, it is possible to eliminate seating failure due to chips, and in particular, unmanned operation can be performed smoothly.

〔Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic diagram of a two-spindle lathe in which a work loading control device according to an embodiment of the present invention is used. In the figure, 1.2 indicates the first . The second main shaft chucks are respectively connected to the main shaft spindles and are rotatable. On the front side of the spindle chuck 1.2 there is a first. Second turrets 3 and 4 are provided facing each other, and various tools 5 are attached to their outer peripheral surfaces. In addition, a blow hose 6 for air blowing the seating surface of the chuck is installed on the upper part of the main shaft chuck 1.2.
is provided.

A loader 10 is disposed above the spindle chuck 1.2. The loader 10 has a loader shaft 11 configured to be able to slide and rotate in the front-rear direction (perpendicular to the paper plane in the drawing), and an arm 12 having a plurality of separate ends is fixed to the loader shaft 11. ing. Loader chucks 16 for gripping a workpiece are provided at four locations at the tip of the arm 12. Further, although not shown, a reversing device for reversing the workpiece is provided near the loader 10.

FIG. 1 shows a control block diagram for controlling the loader 10 and air blower.

In the figure, the same reference numerals as in FIG. 2 indicate the same parts. 13, the workpiece is correctly attached to the spindle chuck l.

seating determination means for determining whether or not the person is seated on the vehicle;
An air discharge hole 30 is provided at a predetermined location on the seating surface of the spindle chuck 1.2 and discharges air toward the contact surface between the chuck and the workpiece, and the air supply pressure to the air discharge hole 30 is detected. It consists of means. 14 is a blowing means including the blow hose 6 shown in FIG. 2, etc.; 15 is a control means for controlling the loader 10 and the blowing means 14 according to the seating determination result, and is constituted by, for example, an NC device in the main body of the apparatus.

Next, the operation will be explained.

First, the workload loading operation will be explained. The workpiece material is transported by a chute (not shown).
It is gripped by the loader chuck 16 of the loader 10 in the state shown in FIG. Then, the loader shaft 11 is projected forward, and then the arm 12 is rotated as shown by the arrow in FIG. 2, so that the loader chuck 16 gripping the workpiece faces the main shaft chucks 1 and 2 (as shown in FIG. 2). (See dash-dotted line). In this state, the loader shaft 11 is moved backward, and the workpiece is transferred from the loader chuck 16 to the spindle chucks 1 and 2. Thereafter, the loader 10 returns to its original position as shown in FIG.

When the machining of one side of the workpiece is completed, the loader 10
moves forward in the same manner as described above, rotates, and transfers the workpiece to the reversing device above the spindle chuck. After the workpiece is reversed, the loader 10 again transfers the workpiece to the spindle chuck 1, in order to machine the unfinished surface.
Attach it to 2.

The workpiece whose surface and 's surface have been machined in this manner is held by the loader 10 in the same manner as described above, and is transferred from the loader 10 to a discharge chute.

The operation of attaching a workpiece to the spindle chuck 1.2 will be explained according to the flowchart in FIG. By the above-described loading operation (step 20), the workpiece is seated on the seating surfaces of the spindle chucks 1 and 2 (step 21). After the workpiece is transferred from the loader chuck 16 to the spindle chucks 1 and 2, the air discharge holes 30 of the spindle chucks 1 and 2
supply air to. This air pressure is detected to determine whether the workpiece is seated in a normal state (step 22). If the seat is not seated in a normal state, air leakage occurs and the air pressure becomes below a predetermined pressure. In this case, the seating determining means 13 determines that the seating is NG (step 22). If seating is OK, loader 1
0 returns to its original position as shown in Figure 2 (step 27).
), processing is performed.

If it is determined in step 22 that the seating is not successful, it is determined how many times the seating has occurred (step 23). If the number of seating attempts is, for example, less than the fifth, the workpieces in the spindle chucks 1 and 2 are gripped again by the loader chuck 16, and the workpieces are temporarily evacuated (step 24), that is,
Release the workpiece from the spindle chuck 1.2. Then, while opening and closing the spindle chuck 1.degree. 2, the seating surface is blown with air by the blowing means 14 (step 25), and the device is seated again.

This operation of steps 21 to 25 is repeated to eliminate seating failure due to chips.

Also, if it is determined that the seating is not successful after four tries, for example, there is a high possibility that the cause of the seating failure is not chips but other causes, so stop the machine and turn on the warning lamp. (Step 26).

Here, in the case of a two-spindle lathe, the one whose seating is determined to be OK transfers the workpiece to the main spindle chuck side, and repeats the above operation only on the NG side.

In this embodiment, most of the machine stoppages due to adhesion of chips are eliminated, and the number of machine stoppages is significantly reduced, especially during unmanned operation at night, and the machine operating rate is greatly improved.

In the above embodiment, the present invention was applied to a two-axis lathe, but the present invention can also be applied to loading control of a normal single-axis lathe or other machine tools such as a machining center. Of course, the same effects as in the embodiment described above can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, when loading a workpiece and the seating check determines that the seating is not successful, the workpiece is first evacuated, the seating surface is blown with air, and the seating operation is performed again. This eliminates most of the machine stoppages caused by adhesion of chips, and has the effect of significantly improving the machine operating rate, especially during unmanned operation.

[Brief explanation of the drawing]

FIG. 1 is a control block diagram of a work loading control device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a two-axis lathe having the work loading control device, and FIG. 3 shows the operation of the work loading control. It is a flow chart for explanation. 1.2... Main shaft chuck, 6... Blow hose, l
O... Loader, 13... Seating determination means, 14...
Blow means, 15... control means.

Claims (1)

[Claims] (1) A work loading control device for a machine tool when a workpiece, which is a workpiece, is mounted on a chuck by a loader, comprising seating determination means for determining whether or not the workpiece is properly seated on the chuck; a blowing means for blowing air on the seating surface of the chuck; and when a seating failure is detected by the seating determination means, the loader and the blowing means are controlled, the loader temporarily retracts the work, and the blowing means removes the chuck. A work loading control device for a machine tool, comprising: a control means for blowing air onto a seating surface;