JPH01316102A - Lathe work machine - Google Patents

Abstract

PURPOSE:To confirm the perfectness in the cut for a work and prevent the destruction of a chuck, etc. by varying the revolution speed of one main spindle and detecting the difference of revolution speed between the other main spindle. CONSTITUTION:A main control means 5 grasps a work 3 on a main spindle 1 by using a chuck 2 through a driving means 4, and revolves the work 3 at a prescribed revolution speed, and a subcontrol means 10 revolves a submain spindle 7 at the equal revolution speed through a driving means 9, and the main spindle 7 is shifted in the X and Z axis directions, and the chuck 8 is allowed to grasp the work 3. After a tip 15 cuts the work 3 according to a working program, the control means 5 reduces the revolution speed of the main spindle 1, and when the perfect cut is executed, the main spindle 7 continues revolution by a prescribed quantity, while if the perfect cut is not executed because of the defects of the tip 15, the revolution speed of the main spindle 7 reduces. A revolution speed detecting means 11 detects the revolution speed of the main spindle 7, and a revolution speed detecting means 6 detects the revolution speed of the main spindle 1, and a judging means 13 judges that the perfect cut is executed, when the difference of the revolution speed is outside the error range of a error setting means 12, while if the error is inside the range, the judging means 13 judges the perfect cut is not carried out.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has at least two main spindles and a tool rest, the two main shafts grasp a workpiece, and the tool rest allows
This article relates to a lathe machine tool that can cut through workpieces.

[Prior Art] Conventionally, a lathe machine tool for cutting off a workpiece, as shown in FIG. Furthermore, the workpiece 103 is rotated by driving the ambidextrous shafts 100 and 101 in synchronization, and the workpiece 103 is cut off by the tip 104 of the tool post 102.

Further, after the workpiece 103 is cut off by the tool rest 102, the sub-spindle 101 is moved laterally while holding the cut-off workpiece piece 105, and the next processing operation is started.

[Problems to be Solved by the Invention] However, in the conventional lathe machine tool, if the tip 104 of the tool post 102 is missing, the workpiece 103 may not be completely cut off. As a result, since the sub-spindle 101 is moved laterally without the workpiece 103 being completely separated, there is a problem that the chuck of the sub-spindle 101 may be broken.

SUMMARY OF THE INVENTION In view of the problems of conventional lathe machine tools, it is an object of the present invention to provide a lathe machine tool that can confirm that the workpiece has been completely cut off.

[Means for Solving the Problems] Claim 10 The present invention provides a main spindle, a main spindle drive means for driving the main spindle, a main control means for controlling the main spindle drive means, a sub spindle, and a main spindle for controlling the main spindle. A lathe machine tool comprising a sub-spindle driving means for driving a sub-spindle, a sub-control means for controlling the sub-spindle driving means, and a cutter means for cutting off a work gripped and held by the main spindle and the sub-spindle. In the above, the main control means or the sub-control means is a means capable of changing the rotational speed of the main spindle or the sub-spindle by a predetermined amount after the cutter means cuts off the workpiece, and the error setting means sets an error range in advance. , a main rotation speed detection means for detecting the rotation speed of the main spindle, a sub rotation speed detection means for detecting the rotation speed of the sub spindle, and the outputs of the main rotation speed detection means and the sub rotation speed detection means are manually operated. The invention according to claim 2, characterized by comprising a determining means for comparing the difference with the output of the error setting means and determining whether the detected rotational speed difference is outside the error range. The invention relates to a main spindle, a main spindle drive means for driving the main spindle, a main control means for controlling the main spindle drive means, a sub spindle, a sub spindle drive means for driving the sub spindle, and a sub spindle for driving the sub spindle. In a lathe machine tool comprising a sub-control means for controlling a main spindle driving means, and a cutter means for cutting off a work piece gripped by the main spindle and the sub-spindle, the main control means or the sub-control means , means capable of changing the number of revolutions of the main spindle or sub spindle by a predetermined amount after the cutoff is cut off by the cutter means, and an error setting means for setting an error range in advance; The output from the sub-rotation speed detection means or the main rotation speed detection means for detecting the rotation speed is compared with the output of the error setting means, and whether the detected amount of change in the rotation speed is within the error range. The above objective is achieved by providing a determination means for determining whether or not the information is correct.

[Operations] The present invention according to claim 1 provides that when cutting off a work gripped by the main spindle and the sub spindle, for example, the main control means controls the rotating part of the main spindle after cutting off the workpiece by the cutter means. While changing the rotation speed by a predetermined amount, the judgment means manually inputs the outputs of the main rotation speed detection means and the sub rotation speed detection means, compares the difference with the output of the error setting means, and determines the detected rotation speed difference. The present invention according to claim 2 is characterized in that when cutting off the work gripped by the main spindle and the sub spindle, for example, the main control means may cut off the workpiece by the cutter means. After that, the rotation speed of the rotating part of the main spindle is changed by a predetermined amount, and the determination means compares the output from the rotation speed detection means of the sub-spindle that has not been changed with the error range of the error setting means, and It is determined whether the detected amount of change in rotational speed is within the error range.

[Examples] The present invention will be described below based on drawings showing examples thereof.

FIG. 1 is a front view including a block diagram showing one embodiment of a lathe machine tool according to the present invention.

In the figure, a main spindle 1 is a means for gripping and holding one end of a workpiece 3 with a chuck 2 and rotating it, and is fixed to the main body of the apparatus. The main spindle driving means 4 is means such as an electric motor that rotates the rotating portion of the main spindle 1 at a predetermined rotation speed.

The main control means 5 is a means for controlling the drive of the main spindle driving means 4 by using a computer or the like to reduce the rotation of the rotating portion of the main spindle 1 by a predetermined amount, as will be described later. Note that instead of adding such a function to the main control means 5, a dedicated control means for that function may be provided. Reference numeral 6 denotes main rotational speed detection means such as a pulse generator for detecting the rotational speed of the main spindle drive means 4.

The sub-spindle 7 is a means for gripping and holding the other end of the workpiece 3 and rotating it with a chuck 8 . This sub-spindle 7 is
It has a structure that allows movement in the X-axis direction and the Z-axis direction.

The sub-spindle driving means 9 is a means such as an electric motor that rotates the rotating portion of the sub-spindle 7 at a predetermined rotation speed. The sub-control means 10 is a means for controlling the drive of the sub-spindle drive means 9 using a computer or the like as described later.

The sub-rotation speed detection means 11 is a means such as a pulse generator that detects the rotation speed of the sub-spindle drive means 9.

The error setting means 12 is a means for presetting an error range in which cut-off is incomplete. Computer R
This is realized using AM storage means or the like. The reason for setting this error range is that if the spindle drive means 4.9 causes small rotational speed fluctuations such as natural fluctuations of the electric motor, it is not treated as an error, but it is possible to distinguish between that case and the case of incomplete cut-off, and to ensure This is to enable detection of imperfections. For example, in the data numbers of the parameters of the control device, data number D98 is set as the + side error range, and data number D100 is set as an example error range. Standard settings are D98=+10rpm, D10
0=-10 rpm.

The determining means 13 inputs the outputs of the main rotation speed detection means 6 and the sub rotation speed detection means 11, compares the difference therewith with the output of the error setting means 12, and determines the detected rotation speed difference as the error. This is a means of determining whether the value is out of range, and a microcomputer is usually used. Alternatively, the determining means 13 determines whether the sub-rotational speed detecting means 11 of the sub-spindle 7 is not lowered by the sub-controlling means 10.
and the output of the error setting means 12 to determine whether the detected amount of decrease in rotational speed is within the error range, and is realized using a computer or the like. .

The output signal of the determination means 13 is used, for example, to generate an alarm or to control the drive stop in the main control means 5 and the sub-control means 10.

The main tool rest 14 is a twelve-index turret tool rest, and a tip 15 is attached thereto. This main tool rest 14 is movable in the X-axis direction and the Z-axis direction. The tip 15 is a blade that comes into contact with and cuts off the workpiece 3 by moving in the X-axis direction and the Z-axis direction. Note that 16 is a tool rest driving means such as a servo motor that drives the tool rest 14, and 17 is a tool control means using a computer or the like that controls the tool rest driving means 16.

The sub-turret 18 is a water indexing turret tool rest for carrying out the next process after the cutting-off process of the workpiece 3.

Next, the operation of the embodiment of the lathe machine tool according to the present invention will be described.

First, +1Orpm and -10rp are set in the error setting means 12.
Set m.

The main control means 5 drives the main spindle drive means 4 to rotate the main spindle 1 at a predetermined rotational speed with the workpiece 3 gripped and held by the chuck 2 .

Next, the sub-control means 10 drives the sub-spindle drive means 9 to rotate the sub-spindle 1 at the same rotation speed as the predetermined rotation speed. Thereafter, the sub-spindle 1 moves along the X and Z axes to approach the workpiece 3, and grips and holds the workpiece 3 with the chuck 8.

Thereafter, the tool rest 14 is moved, the tip 15 is brought into contact with the workpiece 3 (see broken line), and the workpiece 3 is cut off.

After the tip 15 of the tool rest 14 is moved and cut off according to the program, the main control means 5 lowers the main spindle 10 rotation speed by ΔS. This ΔS is a value that is sufficiently larger than the error range ±lorpm, and is, for example, 50 rpm. In the data number of the parameter of the control device, when N is set in the data number D102, ΔS=(N/8191)X (maximum rotational speed of the main spindle). The standard is N is 82.

In this way, if the rotational speed of the main spindle 1 decreases by △S, if the workpiece 3 is completely cut off, the sub spindle 7 will not be affected at all, so the sub spindle 7 will be reduced by the predetermined amount. It should continue to rotate. However, if the workpiece 3 is not completely cut off due to a defect in the tip 15, etc., the decrease in the rotational speed of the main spindle 1 will cause the workpiece 3 connected in this way to be cut off to the sub spindle 7 side. As a result, the rotational speed of the sub-spindle 7 decreases.

The sub-rotation speed detecting means 11 detects the rotation speed of the sub-main shaft 7. In addition, the main rotation speed detection means 6
detects the rotation speed of the main spindle 1.

The determining means 13 inputs the outputs of the main rotation speed detection means 6 and the sub rotation speed detection means 11, compares the difference with the output of the error setting means 12, and determines the detected rotation speed difference as the error. Determine if it is out of range. If the difference exceeds 1 rpm, it is determined that the workpiece 3 is completely cut off as outside the error range, and if it is within 10 rpm, it is determined that the workpiece 3 is not completely cut off as within the error range. Alternatively, the determining means 1 inputs only the rotation speed output of the sub-rotation speed detection means 11 and determines the amount of decrease in the rotation speed of the sub-spindle 7 from the original rotation speed and the error range of the error setting means 12. If the amount of decrease is outside the error range, it is determined that the workpiece 3 has been completely cut off, and if it is within the error range, it is determined that the workpiece 3 has been completely cut off. Note that the timing of this judgment is, for example, based on data number T3.
By setting Q Q 0 m5ec, it is possible to make the determination 1000 m5ec after issuing a command to reduce the rotation speed. This is to enable reliable judgment.

If it has not been completely cut off, judgment method 13
For example, it causes the computer to issue an alarm or sends a signal to the main control means 5 and the sub-control unit means 10 to stop the rotation of the main shaft.

Furthermore, if a plurality of cut-off knives are attached to the main tool post 14, it is possible to find a new cut-off knife and restart the cut-off process.

When the work piece 31 is completely cut off, the sub-main shaft 7 rotates while holding the cut piece 31 and moves in the X-axis direction. After that, the sub-turret 18 moves the workpiece 3
Perform back processing on 1. On the other hand, the main spindle stops rotating, opens the chuck 2, and pulls out the next work 3 forward. Thereafter, the chuck 2 is tightened and the rotational speed is increased to the predetermined amount.

In the above embodiments, the rotational speed of the main spindle 1 is lowered by a predetermined amount, but it may be increased by a predetermined amount. Furthermore,
In the above embodiment, the rotation speed of the main spindle 1 is decreased and the rotation speed of the sub spindle 7 is detected, but conversely, the rotation speed of the sub spindle 7 is decreased or increased, The difference in the rotation speeds of the dual shafts may be detected, or the main spindle 10 rotation speed may be detected by the main rotation speed detection means 6.

[Effects of the invention As is clear from the above explanation, claims 1.2
The lathe machine tool according to the present invention changes the rotation speed of one spindle and detects the difference in rotation speed with the other spindle or the rotation speed of the other spindle, thereby checking the completeness of parting off the workpiece. This prevents inconveniences such as moving the spindle and causing failures even though the workpiece has not been cut off.

[Brief explanation of the drawing]

FIG. 1 is a front view including a block diagram showing one embodiment of a lathe machine tool according to the present invention, and FIG. 2 is a front view showing a conventional lathe machine tool. 1... Main spindle 2... Chuck 3... Workpiece 4... Main spindle driving means 5... Main control means 6... Main rotation speed detection means 7... Sub spindle 8... Chuck 9...Sub spindle drive means 1
0...Sub control means 11...Sub rotation speed detection means 12...Error setting means 13...Determination means Applicant: Mori Seiki Seisakusho Co., Ltd.

Claims (2)

[Claims] (1) A main spindle, a main spindle drive means for driving the main spindle, a main control means for controlling the main spindle drive means, a sub spindle, a sub spindle drive means for driving the sub spindle, and its sub spindle. In a lathe machine tool comprising a sub-control means for controlling a spindle drive means, and a cutter means for cutting off a work gripped and held by the main spindle and the sub-spindle, the main control means or the sub-control means may After cutting off the workpiece using a knife,
It is means capable of changing the rotation speed of the main spindle or sub spindle by a predetermined amount, and includes an error setting means for setting an error range in advance, a main rotation speed detection means for detecting the rotation speed of the main spindle, and a means for changing the rotation speed of the sub spindle. A sub-rotation speed detection means for detecting the rotation speed, the outputs of the main rotation speed detection means and the sub-rotation speed detection means are inputted, and the difference therebetween is compared with the output of the error setting means, and the detected rotation speed difference is determined. A lathe machine tool characterized by comprising: judgment means for judging whether or not the error is outside the error range. (2) A main spindle, a main spindle drive means for driving the main spindle, a main control means for controlling the main spindle drive means, a sub spindle, a sub spindle drive means for driving the sub spindle, and its sub spindle. In a lathe machine tool comprising a sub-control means for controlling a spindle drive means, and a cutter means for cutting off a work gripped and held by the main spindle and the sub-spindle, the main control means or the sub-control means may After cutting off the workpiece using a knife,
It is means capable of changing the rotation speed of the main spindle or sub spindle by a predetermined amount, and includes an error setting means for setting an error range in advance, and a sub rotation speed detection means or main for detecting the rotation speed of the sub spindle or the main spindle. Comparing the output from the rotation speed detection means and the output from the error setting means,
A lathe machine tool characterized by comprising: judgment means for judging whether the detected amount of change in rotational speed is within the error range.