KR20140137937A - Device for compensating ram sinking and warpage of boring machine - Google Patents

Abstract

The present invention relates to an apparatus for compensating for the sinking and bending of a ram of a horizontal boring machine. To be specifically, the apparatus for compensating for the sinking and bending of a ram of a horizontal boring machine can compensate for a decrease in machining accuracy due to sinking and bending caused by self-weight or additional attachment of an optional device (an attachment) when a ram spindle including a ram of a horizontal boring machine moves in a horizontal direction. In other words, the apparatus can compensate for sinking value α to the transfer of the ram of the horizontal boring machine using a hydraulic cylinder installed in the upper part of a head stock, and can compensate for bending value β of the ram due to the weight of the attachment using a hydraulic cylinder and a tension bar assembled at the back end of the ram at the same time. Therefore, the apparatus for compensating for the sinking and bending of a ram of a horizontal boring machine can maintain parallel between the ram and the ram spindle and can improve machining accuracy of an object to be machined.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for compensating ram deflection and warping of a horizontal boring machine,

The present invention relates to a ram deflection and deflection compensating apparatus for a horizontal boring machine, and more particularly, to a deflection and deflection compensating apparatus for a deflection and deflection of a ram of a horizontal boring machine, And more particularly, to a ram deflection and deflection compensating apparatus for a horizontal boring machine capable of compensating for a phenomenon in which machining accuracy is lowered due to warping.

BACKGROUND ART [0002] In general, a boring machine, which is a type of machine tool, is a machining device that performs a machining operation such as rounding a previously formed hole by drilling, forging, casting or the like, Lt; / RTI >

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows the ideal ram and spindle feed state of a boring machine.

1, the ideal ram and spindle delivery is such that the ram 12, Ram, is carried in the head stock 10 in a transportable manner and a Ram spindle 14 is transported in the ram 12 While being conveyed in the Z-axis direction (Ram feed) and W-axis direction (Main axis feed), it is conveyed without deflection or warping of the ram, but it is practically impossible in real machines.

2 showing the deflection phenomenon of the ram, when deflection (?) Due to the transfer of the ram 12 in the head stock 10 occurs, the sagging phenomenon occurs at this time, And can be found in the irregularities formed in the slide path surface of the slide contact.

3, when the attachment 20 (tool, etc.) is attached to the front end portion of the ram 12, deflection and bending The deflection and bending phenomenon at this time is caused by the weight of the ram and the attachment, which is one of the optional devices.

As described above, when the deflection and the warping phenomenon occur during the transfer of the ram and the main shaft, the machining precision is changed by the value α or β more than the actual machining area when the work requiring precision machining is performed, .

Accordingly, there is a need for a compensation method that can compensate for deflection and warping of the ram and the main shaft, thereby increasing the machining accuracy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a method of compensating for deflection of a ram of a horizontal boring machine by using a hydraulic cylinder provided at the top of a headstock, The compensation of the ram and the spindle by compensating the value beta by using the hydraulic cylinder and the tension bar assembled at the rear of the ram, And it is an object of the present invention to provide a bending compensation device.

According to an aspect of the present invention, there is provided a deflection compensating device for lifting a head stock using hydraulic pressure as means for compensating a deflection value of a ram on an upper portion of a head stock of a horizontal boring machine, And a deflection compensating device for holding the ram horizontally using a tension force and an oil pressure is connected as a means for compensating the deflection value of the ram due to the weight of the attachment in the inside and the rear of the ram. A ram deflection and bending compensation device of a horizontal boring machine is provided.

The deflection compensation apparatus according to a preferred embodiment of the present invention includes: a first hydraulic cylinder mounted on an upper surface of a front end of a head stock; A hydraulic pressure supply means for providing hydraulic pressure in the first hydraulic cylinder for lifting the piston in the first hydraulic cylinder; A column body disposed at one side of the head stock; A counterweight disposed in the column body so as to be able to move up and down; A wire rope having one end connected to the counterweight and the other end connected to the piston top of the first hydraulic cylinder; And a control unit.

Preferably, two or more balance rollers for guiding the wire rope are mounted on the upper surface of the column body.

A guide groove is formed on one side surface of the headstock along the vertical direction, and a guide bar inserted into the guide groove along the vertical direction is integrally formed on the inner surface of the column body.

The warp compensation device according to a preferred embodiment of the present invention comprises: a second hydraulic cylinder mounted at the rear of a ram; Hydraulic pressure providing means for providing hydraulic pressure in the second hydraulic cylinder to reverse the piston in the second hydraulic cylinder; Wherein the front end of the ram is fixed to the inner wall surface of the front end side of the ram and the rear end of the ram is extended across the second hydraulic cylinder; A nut structure integrally fastened to the rear of the piston of the second hydraulic cylinder and tightening the rear end of the tension bar and integrated with the tension bar; And a control unit.

Preferably, the mounting frame is integrally attached to the rear wall of the ram, and the rear end of the tension bar is mounted on the rear end of the mounting frame.

In particular, the hydraulic pressure providing means comprises: a hydraulic motor and a pump for applying hydraulic pressure for deflection and wheel compensation to the first hydraulic cylinder and the second hydraulic cylinder; A proportional electronic hydraulic pilot relief valve for instructing the balancing valve to regulate the compensating hydraulic pressure according to the position of the ram; A balancing valve for reducing the hydraulic pressure from the hydraulic motor and the pump to the hydraulic pressure determined by the command of the proportional electronic hydraulic pilot relief valve and supplying the reduced pressure to the first hydraulic cylinder and the second hydraulic cylinder; And a control unit.

Through the above-mentioned means for solving the problems, the present invention provides the following effects.

According to the present invention, it is possible to compensate deflection of the horizontal boring machine by the horizontal boring machine by compensating deflection of the ram on the head stock of the horizontal boring machine by connecting a deflection compensation device for lifting the head stock to the hydraulic pressure .

In order to compensate for the deflection of the ram and the main shaft due to the weight of the attachment attached to the front end of the ram, a bending compensating device for holding the ram horizontally using the tension and tension of the tension bar is connected to the inside and the rear of the ram This makes it possible to compensate for deflection and warping of the horizontal boring machine.

Even if the deflection and warping of the ram and the deflection of the main shaft occur, the parallelism of the ram and the main shaft can be maintained by compensation operation of the deflection compensating device and the deflection compensating device, .

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram showing ideal ram and spindle feed states of a horizontal boring machine,
FIG. 2 is a schematic view showing a ram deflection phenomenon of a horizontal boring machine,
3 is a schematic view showing the warping of the ram and the main shaft of the horizontal boring machine,
FIG. 4 is a block diagram of a ram deflection compensation apparatus for a horizontal boring machine according to the present invention,
5 is a cross-sectional view illustrating a hydraulic cylinder portion of a ram deflection compensation apparatus of a horizontal boring machine according to the present invention,
FIG. 6 is a schematic view showing a bending compensation apparatus for a horizontal boring machine according to the present invention.
7 is a cross-sectional view showing a hydraulic cylinder portion of a bending compensation apparatus of a horizontal boring machine according to the present invention,
FIG. 8 is a graph illustrating the results of measuring displacement before and after ram deflection and flexural compensation according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a ram of a horizontal boring machine, and more particularly to a ram of a horizontal boring machine, in which the main shaft is moved in the horizontal direction to process an object to be machined, the weight of the ram or the optional equipment (attachment) There is a point in that it is possible to compensate for the occurrence of sagging or warping of the main spindle, thereby improving the machining accuracy with respect to the workpiece.

To this end, as shown in FIG. 4, the head stock 10 is hydraulically provided as a means for compensating for deflection of the ram on the head stock 10 in which the ram of the horizontal boring machine is installed back and forth, And a means for compensating for the deflection of the ram due to the weight of the attachment attached to the main shaft at the rear and inside of the ram 12 as shown in Fig. 6 attached hereto, A deflection compensating device 200 capable of holding the ram 12 horizontally using a tension force and an oil pressure is connected.

4 and 5, a deflection compensating apparatus according to the present invention will now be described in detail with reference to the accompanying drawings.

The deflection compensating apparatus 100 is configured such that when the ram of the horizontal boring machine is transported in the horizontal direction toward the object to be processed, the sagging phenomenon of the ram occurs due to the self weight of the ram, .

In Fig. 4, reference numeral 30 denotes a servomotor 30 for feeding the ram.

The servomotor 30 for transferring the ram connected to the ram 12 is housed inside the rear end of the headstock 10. The servomotor 30 is driven in the forward and reverse directions, Exercise.

As a configuration of the deflection compensating apparatus 100, a column body 110 constituting a skeleton is disposed at a position adjacent to the head stock 10 in which the ram 12 is linearly transportable.

At this time, a counterweight 112 having a constant weight is disposed inside the column body 110 so as to be able to ascend and descend by hanging from the wire rope 114.

A guide groove 16 is formed on one side surface of the headstock 10 along the vertical direction and a guide groove 16 is formed in the inner side surface of the column body 110 along the up- A bar 118 is integrally formed.

The guide bar 118 of the column body 110 and the guide groove 16 of the headstock 10 are slidably inserted into the slide body 110 when the headstock 10 is lifted by hydraulic pressure, The lifting direction of the head stock 10 can be constantly guided.

A first hydraulic cylinder 102 is mounted on the upper surface of the front end of the headstock 10 in order to utilize the hydraulic pressure for deflection compensation of the ram. And the piston 104 is vertically movable by hydraulic pressure.

A hydraulic pressure supply hole 103 is formed at a predetermined position of the body part of the first hydraulic cylinder 102 so as to move the piston 104 in the first hydraulic cylinder 102. The hydraulic pressure supply hole 103, A hydraulic pressure supply means 130 for supplying hydraulic pressure is connected.

5, the other end of the wire rope 114, one end of which is connected to the counterweight 112, is connected to the piston 104 of the first hydraulic cylinder 102 via a common joint means such as a clamp, ) Is connected to the upper end.

Preferably, two or more balance rollers 116 are rotatably mounted on the upper surface of the column body 110 to guide the wire rope 114 in order to guide the wire rope 114 smoothly.

The hydraulic pressure providing means 130 includes a hydraulic motor and a pump 132 for applying a hydraulic pressure for compensating deflection of the ram to the first hydraulic cylinder 102, A proportional electromagnetic hydraulic pilot relief valve 134 instructing the balancing valve 136 to control the hydraulic pressure from the hydraulic motor and the pump 132 to the hydraulic pressure determined by the command of the proportional electromagnetic hydraulic pilot relief valve 134, And a balancing valve 136 for supplying the hydraulic pressure to the hydraulic cylinder 102.

More specifically, the proportional electromagnetic pilot relief valve 134 reads the position value of the ram 12 when it is fed from the numerical controller (NC), and feeds the compensating hydraulic pressure corresponding to each position to the balancing valve 136 And the balancing valve 136 serves to apply the hydraulic pressure determined by the command of the proportional electromagnetic hydraulic pilot relief valve 134 to the hydraulic pressure supply hole 103 of the first hydraulic cylinder 102. [

On the other hand, deflection amount data for the deflection compensation of the ram 12 by the transfer position is accumulated and stored in the numerical control unit.

For this, the center of gravity of the head stock 10 is moved in accordance with the conveying position of the ram 12, and the deflection amount of the ram 12 is different for each conveying section of the ram 12, And the oil pressure required for correcting the deflection of the ram against the deflection value of the ram is measured by applying the oil pressure to the first hydraulic cylinder 102 that is appropriate for the deflection of the section actually measured .

At this time, since the deflection amount differs for each transfer position of the ram, the deflection amount data for each transfer position of the ram is accumulated for each section by actual measurement and testing as described above, by dividing the range from the origin to the maximum transfer distance by several proper sections.

In this way, deflection amount data by position at the time of transferring the RAM is transmitted to the numerical control unit, and data of the deflection amount of the ram and the hydraulic pressure to be compensated are stored for each section.

Accordingly, data is transferred to the proportional electro-hydraulic pilot relief valves in accordance with the positional result when the ram is transferred, and the balancing valve, which receives the command of the proportional electronic pilot relief valve, The hydraulic pressure supplied to the cylinder is adjusted to the hydraulic pressure for compensation of the deflection amount and supplied to the first hydraulic cylinder.

Hereinafter, the operation of the deflection compensating apparatus of the present invention will be described.

First, when the ram 12 in the head stock 10 advances by the driving of the ram transfer servomotor 30, the value of the transfer position of the ram 12 is read by the numerical control unit.

Subsequently, the proportional electromagnetic pilot relief valve 134 transmits the hydraulic pressure compensation value to compensate the deflection amount to the balancing valve 136 when the hydraulic compensation value corresponding to the position value of the RAM read by the numerical control section is transmitted to the proportional electromagnetic pilot relief valve 134 And the balancing valve 136 regulates the hydraulic pressure supplied to the first hydraulic cylinder 102 to the hydraulic pressure for compensation of the deflection amount and supplies the hydraulic pressure to the first hydraulic cylinder 102. [

When the piston 104 is lifted and lowered by the hydraulic pressure supplied to the first hydraulic cylinder 102, the counterweight 112 connected by the piston 104 and the wire rope 114 descends in the column body 110 The head stock 10 with the ram 12 is lifted up to compensate for deflection of the ram 12, that is, to a position where the position of the ram 12 is horizontal.

Accordingly, since the deflection amount of the horizontal boring machine is compensated for by the respective transfer positions of the ram, it is possible to maintain the rams parallel to each other at the time of transferring the ram, thereby improving the machining accuracy of the machining product.

Hereinafter, a concrete configuration of the bending compensation apparatus of the present invention will be described with reference to FIGS. 6 and 7.

When the main shaft of the horizontal boring machine and the main shaft of the ram are transported in the horizontal direction toward the object to be processed, the deflection compensation device 200 causes the ram to be warped due to the weight of the ram and the attachment attached to the main shaft So that the ram can be held horizontally.

To this end, two or more second hydraulic cylinders 202 are mounted side by side on the rear surface of the ram 12, and a piston 204 is installed in the second hydraulic cylinder 202 such that the piston 204 can be moved back and forth.

Of course, the hydraulic pressure supply means 130 for supplying hydraulic pressure to the hydraulic pressure supply hole 203 of the second hydraulic cylinder 202 is connected to the piston 204 in the second hydraulic cylinder 202, The hydraulic pressure providing means 130 is configured in the same manner as the hydraulic pressure providing means 130 for supplying the hydraulic pressure to the first hydraulic cylinder 102, and thus a detailed description thereof will be omitted.

At this time, two or more tension bars 210 are disposed inside the ram 12 such that the tension bars 210 can be moved back and forth. The front end of each tension bar 210 is fixed to the inner wall surface of the front end of the ram 12, The rear end extends across the interior of the second hydraulic cylinder 202.

A nut structure 220 is integrally fastened to a rear portion of the piston 204 of the second hydraulic cylinder 202. The nut structure 220 has a tension that crosses the inside of the second hydraulic cylinder 202, The rear end of the bar 210 is tightened and integrated, and the rear end of the tension bar 210 passes through the nut structure 220 as a clearance length and extends further backward.

A mounting frame 18 is integrally attached to the rear wall surface of the ram 12. A rear end of the tension bar 210 is fixed to the rear end of the mounting frame 18.

More specifically, a state in which the length of the rear end of the tension bar 210 extending further beyond the nut structure 220 is rested on the mounting frame 18 attached to the rear wall of the ram 12 do.

On the other hand, the bending amount data for the bending compensation of the ram 12 and the bending amount data for the transfer position of the main shaft are accumulated and stored in the numerical control unit.

To this end, an attachment is attached to the front end of the main shaft 14, which is housed in the ram 12 such that it can be moved forward and backward, and then the actual amount of deflection is measured using a normal measuring mechanism, The hydraulic pressure for compensating the measured bending amount is supplied to the second hydraulic cylinder 202 and the tension bar 210 is pulled to test the hydraulic pressure required to compensate for the bending value of the ram and the main shaft.

For reference, there are various kinds of attachments such as RAA, UAA, CAA, and Facing head. Therefore, it is preferable to mount a sensor for detecting the type of attachment.

Therefore, the sensor detects the type of attachment mounted on the sensor, transmits the detected attachment to the numerical control unit, and stores the amount of deflection of the ram and the main shaft corresponding to the attached attachment and the data of the oil pressure to be compensated.

Hereinafter, the operation of the warp compensation apparatus of the present invention will be described.

First, when the ram 12 in the head stock 10 advances due to the driving of the servomotor 30 for transferring the ram, the value of the feed position of the ram 12 is read by the numerical control unit, and at the same time, The numerical control unit detects whether or not it has been detected.

Subsequently, the proportional electromagnetic pilot relief valve 134 transfers the hydraulic compensation value according to the position value of the ram and the type of the attachment read by the numerical control section to the proportional electromagnetic pilot relief valve 134, And the balancing valve 136 adjusts the hydraulic pressure supplied to the second hydraulic cylinder 202 to the hydraulic pressure for compensating the bending amount and supplies the hydraulic pressure to the second hydraulic cylinder 202. [

Accordingly, when the reduced pressure oil is supplied to the second hydraulic cylinder 202, the piston 204 is pushed backward by the supplied oil pressure, and the nut structure 220 integrally fastened with the piston 204 is also moved backward, The tension bar 210, which is tightened by the nut structure 220, is pulled backward to be pulled in a tight state.

When the tension bar 210 is pulled up and retracted in this manner, the tension bar 210 lifts up the front end portion of the ram 12 upwardly. Therefore, while the amount of deflection of the ram 12 is compensated, And keeps it horizontal.

Accordingly, by compensating the deflection amount of the horizontal boring machine by the transfer position of the ram and the spindle, it is possible to maintain the ram parallel to each position at the time of transferring the ram, and as a result, the machining accuracy of the machining product can be improved.

Meanwhile, since the ram deflection and deflection compensation device of the horizontal boring machine according to the present invention is not an absolute compensation device, it is difficult to correct the deflection and deflection of the ram by individually systemizing them.

Therefore, it is preferable to first set the deflection compensation value of the ram first, then set the deflection correction value for the attatchment, etc., and consequently, it is difficult to transfer the ideal ram. As a result, Compensation is possible to converge to a certain level of precision, as opposed to no compensation for deflection and deflection of the ram.

10: Headstock 12: Ram
14: main shaft 16: guide groove
18: Mounting frame 20: Attachment
30: Servo motor for ram feed
100: deflection compensation device 102: first hydraulic cylinder
103: hydraulic pressure supply hole 104: piston
110: Column body 112: Counterweight
114: wire rope 116: balance roller
118: guide bar 130: hydraulic pressure supply means
132: Hydraulic motor and pump 134: Proportional electronic hydraulic pilot relief valve
136: balancing valve 200: bending compensation device
202: second hydraulic cylinder 203: hydraulic pressure supply hole
204: piston 210: tension bar
220: nut structure

Claims (7)

A deflection compensating device (100) for raising a head stock (10) by using hydraulic pressure as means for compensating a deflection value of a ram on a head stock (10) in which a ram (12) And then,
As a means for compensating the deflection value of the ram due to the weight of the attachment in the inside and the rear of the ram 12, a deflection compensating device 200 for holding the ram 12 horizontally using a tension force and an oil pressure is connected And a deflection of the ram of the horizontal boring machine.
The method according to claim 1,
The deflection compensating apparatus (100) comprises:
A first hydraulic cylinder 102 mounted on the upper surface of the front end of the head stock 10;
A hydraulic pressure supply means 130 for supplying hydraulic pressure to the first hydraulic cylinder 102 to raise and lower the piston 104 in the first hydraulic cylinder 102;
A column body (110) disposed at one side of the head stock (10);
A counterweight (112) arranged in the column body (110) so as to be able to move up and down;
A wire rope 114 having one end connected to the counterweight 112 and the other end connected to the upper end of the piston 104 of the first hydraulic cylinder 102;
And a deflection mechanism for deflecting the deflection of the horizontal bending machine.
The method of claim 2,
Wherein two or more balance rollers (116) for guiding a wire rope (114) are mounted on an upper surface of the column body (110).
The method of claim 2,
A guide bar 118 is formed on the inner side surface of the column body 110 and inserted into the guide groove 16 along the vertical direction. Wherein the bending and deflection of the ram of the horizontal boring machine are integrally formed.
The method according to claim 1,
The warp compensation device 200 includes:
A second hydraulic cylinder 202 mounted at the rear of the ram 12;
A hydraulic supply means (130) for providing hydraulic pressure in the second hydraulic cylinder (202) to reverse the piston (204) in the second hydraulic cylinder (202);
The front end of the ram 12 is fixed to the inner wall surface of the front end of the ram 12 and the rear end of the ram 12 is connected to two or more tension bars (not shown) extending across the second hydraulic cylinder 202 210;
A nut structure 220 which is integrally fastened to the rear of the piston 204 of the second hydraulic cylinder 202 and tightens the rear end of the tension bar 210 and is integrated with the tension bar 210;
And a deflection mechanism for deflecting the deflection of the horizontal bending machine.
The method of claim 5,
Wherein a mounting frame (18) is integrally attached to a rear wall surface of the ram (12), and a rear end of a tension bar (210) is mounted on a rear end of the mounting frame (18) Deflection and deflection compensation device.
The method according to claim 2 or 5,
The hydraulic pressure supply means 130 includes:
A hydraulic motor and a pump 132 for applying hydraulic pressure for deflection and wheel compensation to the first hydraulic cylinder 102 and the second hydraulic cylinder 202;
A proportional electromagnetic hydraulic pilot relief valve 134 for regulating the compensating hydraulic pressure for each position of the ram 12 and instructing the balancing valve 136;
A balancing valve (not shown) for reducing the hydraulic pressure from the hydraulic motor and the pump 132 to the hydraulic pressure determined by the command of the proportional electromagnetic hydraulic pilot relief valve 134 and supplying it to the first hydraulic cylinder 102 and the second hydraulic cylinder 104 136);
And a deflection mechanism for deflecting the deflection of the horizontal bending machine.

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