KR20040060176A - One's Regular Position Confirmation Unit of Rotary Table and Method Thereof - Google Patents

Abstract

PURPOSE: A device and method for checking the regular position of a rotary table is provided to prevent the backlash of the rotary table by precisely checking the stop position of the rotary table. CONSTITUTION: A device for checking the regular position of a rotary table is composed of a rotary base(100), switches(230,240), and a rotary driving unit(200). At least one dog(221) is installed at the rotary base. A cylinder(210) is mounted to the rotary base, and moves the dog forward and backward. The switches check the forward/backward motion of the cylinder. A dog checking switch(251) is mounted to the rotary driving unit, and switches on/off according to the touch of the dog.

Description

One's Regular Position Confirmation Unit of Rotary Table and Method Thereof}

The present invention relates to an apparatus and method for confirming the exact position of a rotary table. In particular, by installing a dog at the base of the rotary table and installing a dog check switch on the driving body of the rotary table, it is possible to check whether the driving body stops exactly at a desired position. It relates to an apparatus and method for confirming the position of a rotary table characterized in that to eliminate the factor.

In general, a machine tool is a machine that cuts or grinds a material by giving a proper cutting motion between a material and a tool, and at the same time causing the material or a tool to rotate or linearly move. The machine tool is controlled to process the material.

1 shows a conventional rotary table, and FIG. 2 is a block diagram of a table driving gear and a driving body viewed from a plane, and the motor gear 30 rotates in accordance with the rotation of the motor 20 by the NC 10 command. And it transfers power to the table drive gear 60 through the belt 40 and the gear shaft 50.

Then, power is transmitted through the connecting pin 70 connected to the table driving gear 60 so that the driving body 200 rotates.

In this case, when the driving body 200 moves as much as a desired position, the positioning pin 120 moves forward to prevent the driving body 200 from further rotating, and the positioning pin 120 moves forward to the side of the positioning pin 120. Confirmation sensing means 140 and the reverse confirmation sensing means 130 is further added to check the operation of the positioning pin 120.

In addition, the NC 10 checks whether the driving body has moved as much as commanded through the encoder 80.

However, such a rotary table of the numerically controlled machine tool has a backlash due to excessive gear ratio of the motor 20 which directly drives the driving body 200 and the driving body 200 which is actually rotated by the motor 20. Will occur.

Therefore, when performing the control for fixing the fixed position by comparing the mechanical position of the data in the PLC there was a problem that the fixed position is not normally made due to the error amount due to the backlash.

The present invention is to solve the above problems,

The purpose of this is to set the exact stop of the rotary table correctly to block the error occurrence caused by the backlash.

As a means for achieving the above object,

The present invention includes a rotary base having at least one positioning dog installed therein, and a cylinder mounted with a cylinder for moving the dog forward and backward; A forward and backward check switch for confirming forward and backward movement of the dog check cylinder; And a rotary driving body provided with a dog check switch that is switched by a touch of the dog corresponding to a dog position mounted on the rotary base.

In addition, the dog and the dog confirmation switch is characterized in that the configuration of three pieces in one set.

In addition, the step of advancing the dog transport cylinder and confirming; Instructing the transfer of the rotary table to transfer the table; Decelerating and transferring the rotary table when a first dog having a deceleration switch sensing function is detected; When the second dog that senses the rotary table stop is finally detected, stop the rotary table, advance the fixing pin for the rotary fixing, and if the advancement of the fixing pin is confirmed, reverse the dog transport cylinder and check it. Wow; In this step, the rotary table is characterized in that the step of outputting an alarm when the dog in the last progress or less than the stop position is detected.

1 is a configuration diagram of a conventional rotary table driving device.

2 is a conceptual diagram for explaining a conventional rotary table.

3 is a configuration diagram of the rotary table positioning device of the present invention.

4 is a conceptual diagram for explaining an installation state of the present invention.

5 is an operational flowchart of the present invention.

Explanation of symbols on the main parts of the drawings

10: NC 20: motor

30: motor pulley 40: belt

50: gear shaft 60: table drive gear

70: connecting means 80: encoder

100: rotary base 110: positioning pin feed cylinder

120: positioning pin

130: Positioning pin reverse check switch

140: positioning pin forward confirmation switch

200: drive body 210: dog body transfer cylinder

220: dog body 221, 222, 223: dog

230: dog body reverse confirmation switch

240: dog body forward confirmation switch

251a, 251b, 251c, 252a, 252b, 252c, 253a, 253b, 253c: dog confirmation switch

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 and 4 illustrate a rotary table applied to the present invention, and the rotary table is composed of a rotary base 100 and a rotary driver 200, and a dog 221 is provided on the rotary base 100 of the present invention. And a limit switch 251 to which the dog 221 is touched is installed on the rotary driver 220.

The dog body 220 mounted on the rotary base 100 is configured to move forward or backward by the cylinder 210.

That is, when a command to rotate the rotary drive body 200 is issued, the dog 221 is raised by the hydraulic pumping action of the dog transfer cylinder 210 so that the rotary drive body 200 may sense the dog 221. In this case, it is possible to check whether the rotary driver 200 stops at the time when the dog 221 is sensed.

At this time, if the rotary drive body 200 does not stop at the dog sensing point, it outputs an alarm signal and outputs that the rotary table is pushed out by a predetermined angle by a backlash or the like at the commanded point, thereby continuing the work of the machine tool. Prevent accidents caused by operation and damage to machine tools.

Dogs applied to the present invention can be installed in a plurality of bars, in the embodiment of the present invention shown in Fig. 4 constituted three sets (221, 222, 223) in one set.

In addition, the dog detection limit sensor installed in correspondence with the position of the dog also constitutes a set of three (251a, 252a, 253a).

In addition, in the present invention, four sets of limit sensors are provided, where the installation positions are four surfaces of the driving body 200, and reference numerals 251, 252, and 253 denote a, b, c, and d in parallel.

The reason for configuring three as one set as described above is when the first dog 221 touches the limit switch 251a and the rotary table is decelerated so that the second dog 222 touches the limit switch 252a. This is to recognize that the rotary driver 200 is stopped at the correct position.

Therefore, if the normal operation is performed, the second stage 252a of the limit switch installed in the rotary driver 200 and the second dog 222 installed in the rotary base 100 are finally switched, and at this time, the positioning pin The rotary drive body 200 is strongly supported on the rotary base 100 by transporting the 120 so that a certain fixing can be performed at a desired position.

If the fixing operation of the rotary drive body 200 is normally completed, the feed control cylinder 210 is operated to lower the dog body 220 on which the dogs 221, 222, and 223 are mounted.

However, when the backlash occurs in the above, the second dog 222 touches the limit switch 252a and then proceeds further, so that the third dog 223 and the limit switch 253a are finally contacted, or the table driving body ( There is a case where the first dog 221 and the limit switch 251a are finally contacted because the 200 is no longer moved.

This phenomenon may occur in the backlash phenomenon. When the backlash phenomenon occurs, the driving body may be stopped before the desired stop position, or the driving body may be stopped after the stop position advances by a greater length.

In the present invention, as described above, when the driving body progresses less or further due to the backlash, the alarm is output so that the driving body 200 is not stopped at a desired position so that the user can correct it.

Correcting this will cut off the error factor in the next operation, which will prevent the breakage of the tool or safety accidents during the subsequent work of the machine tool.

In addition, the limit switch set of the present invention made as described above can be installed in a plurality of table driving body bar, in the embodiment of the present invention was installed in four places, of course, a plurality is installed as necessary.

5 is an operation flowchart of the present invention.

Advancing the dog feed cylinder and checking it (S1);

Commanding the transfer of the rotary table to transfer the table (S2);

Decelerating and transferring the rotary table when a first dog having a deceleration switch sensing function is detected (S3);

When the second dog that senses the rotary table stop is finally detected, stop the rotary table, advance the fixing pin for the rotary fixing, and if the advancement of the fixing pin is confirmed, reverse the dog transport cylinder and check it. (S4);

In this step, when the dog of the state where the rotary table progresses less or stops more than the stop position is finally detected, step S5 is outputted.

As described above, the present invention provides the effect of accurately operating the rotary table by accurately determining the stop position of the rotary table.

Although the present invention has been described in connection with the above-mentioned preferred description, various other modifications and variations may be made without departing from the spirit and scope of the invention. Accordingly, the appended claims may be determined to include such modifications and variations as fall within the true scope of the invention.

Claims (3)

A rotary base (100) provided with at least one positioning dog and a cylinder (210) for advancing and retracting the dog; Forward and backward check switches 230 and 240 for confirming forward and backward movement of the dog check cylinder 210; And a rotary drive body (200) provided with a dog check switch switched by a touch of the dog in correspondence with a dog position mounted on the rotary base (100). The method of claim 1, The dog and the dog confirmation switch is a rotary table driving apparatus for a machine tool, characterized in that the configuration of three in one set. Advancing the dog feed cylinder and checking it (S1); Commanding the transfer of the rotary table to transfer the table (S2); Decelerating and transferring the rotary table when a first dog having a deceleration switch sensing function is detected (S3); When the second dog that senses the rotary table stop is finally detected, stop the rotary table, advance the fixing pin for the rotary fixing, and if the advancement of the fixing pin is confirmed, reverse the dog transport cylinder and check it. (S4); The rotary table driving method for a machine tool, characterized in that the step of outputting an alarm when the dog in the state that the rotary table proceeds less than the stop position or further advanced in the step (S5).