KR101536208B1

KR101536208B1 - Method and apparatus of supplying cutting fluids for preventing clogged chips during gun-drilling

Info

Publication number: KR101536208B1
Application number: KR1020140054780A
Authority: KR
Inventors: 이종항
Original assignee: 한국산업기술대학교산학협력단
Priority date: 2014-05-08
Filing date: 2014-05-08
Publication date: 2015-07-13

Abstract

The present invention relates to a coolant supply apparatus for supplying coolant to a chip membrane hood in a gun drilling process, which can supply a supply pressure of coolant to the coolant chamber at a pressure or an instantaneous pressure pulse pressure so as to rapidly discharge chips generated during deep- .
The present invention relates to a coolant supply device for preventing chip clogging in a gland filling process for preventing chip clogging so as to facilitate chip discharge generated during deep hole processing in a gland filling process, the device comprising: a coolant supply line connected to a coolant supply passage; And a pressure sensor for detecting an internal pressure of the coolant supply passage. When the internal pressure of the coolant supply passage exceeds a set value that is higher than a reference value by a predetermined ratio And a controller for controlling the operation of the voltage step-up unit so that the pressure sensor and the voltage step-up unit are electrically connected to each other to control the operation of the voltage step-up unit .

Description

TECHNICAL FIELD [0001] The present invention relates to a coolant supply device for preventing clogging of a chip during machining,

The present invention relates to a cutting oil supply device for a gouging machine, and more particularly, to a cutting tool for supplying cutting oil to a cutting tool, To a coolant supply device and a supply method thereof.

Among the machine tools, the guddle machine has a large depth ratio to the diameter of the hole and is used for deep hole drilling (deep hole drilling). Such a guddle machine is a machine for machining a deep hole in a guddle material to be.

When machining deep holes in a large material such as a mold using such a gully machine, optimum processing conditions must be established in order to improve the productivity. Factors that hinder such optimal machining conditions include material quality of the workpiece, rotation and machining speed of the drill, coolant supply problem, and chip discharge problem.

Among the inhibiting factors of the machining conditions, when the internal structure (that is, the material) is not uniform, the material of the machined material is locally drilled, so that the impact load is transmitted to the drill so that the tip of the drill can be cut. When the overhead is applied during drilling, it is all the thing to reduce overload by reducing the feed speed and the number of revolutions. In addition, when the deep hole is formed by the small diameter drill, the amount of chip generated by the drill bit increases, This has adversely affected the deep hole processing.

For example, when a small diameter and a long hole are machined to be touched, not only the space of the chip discharge flute through which the chip is discharged is narrowed but also the machining distance (length) becomes long, so that a large amount of chips are generated in a narrow space . In such a large number of chips, chip clogging occurs instantaneously during the deep hole processing, so that it is impossible to discharge chips by the preset coolant supply pressure. When such a phenomenon occurs, a sudden overload is applied to the tool to be torn off, so that the tip or the shank of the tornado may be broken or broken, and the productivity and machining accuracy are extremely lowered due to the closed end .

In order to solve the problem of chip emission as described above, there is Korean Patent No. 10-0580884, which is disclosed in the patent document of the prior art document. In this patent document, a cutting oil is selectively supplied to the machining area to provide a smooth supply of cutting oil, and the machined chip can be removed and cleaned.

The above-mentioned patent documents of the prior art documents can selectively supply the cutting oil and the air to jet the high-pressure air during cutting to remove the cut chips. However, in addition to the cutting oil supply line, the air supply path, the compressor for generating compressed air, And a control valve for controlling the second valve. Therefore, the manufacturing cost is increased and the installation thereof is very difficult.

KR 10-0580884 B1 (Registered on May 10, 2006)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problems of the prior art, and it is an object of the present invention to provide a method and apparatus for preventing chip clogging caused by deep- When the internal pressure of the coolant supply passage becomes higher than the set value due to the phenomenon, the supply pressure of the coolant is supplied with the instantaneous pressure, the pulsation pressure or the pressure pulsation pressure to smooth the chip discharge, thereby preventing the chip clogging from occurring. It is possible to increase the efficiency of supply of cutting oil, thereby improving the cooling and lubrication function by cutting oil, preventing breakage of the cutting tool, the machining precision, and improving productivity and productivity. And a method of supplying the same.

The present invention enumerates the features of the present invention in order to achieve the above object.

A feature of the present invention is to provide a coolant supply device for preventing chip clogging in a gland filling process to prevent chip clogging so as to smooth chip discharge generated during deep hole processing in a gouging process. The coolant supply device includes a coolant supply line connected to a coolant supply passage, And a pressure sensor for detecting an internal pressure of the coolant supply passage. The internal pressure of the coolant supply passage is set to a set value higher than a reference value by a predetermined ratio And a control unit electrically connected to the pressure sensor and the voltage step-up unit to control the operation of the voltage step-up unit, wherein the pressure sensor and the voltage step-up unit are connected to each other, do.

The reference value refers to a predetermined coolant supply pressure at which the chip is smoothly discharged. The set value means a pressure that is higher than the reference pressure by a predetermined ratio as the chip is not smoothly discharged.

The pressure sensor may be replaced with a flow sensor that detects that the coolant is not supplied through the coolant supply passage when the chip discharge groove is clogged or that the supply flow rate is reduced.

And the bypass line is connected to the coolant supply line so as to supply the high-pressure coolant bypassing the pressure reducing valve, and a bypass line connected to the coolant supply line and the bypass line, The pressure reducing valve is configured to reduce the pressure of the coolant having a higher pressure than the reference value to a reference value when the internal pressure of the coolant supply passage is detected to be lower than the set value by the pressure sensor . Here, the feed pump means a high-pressure pump that pumps the coolant to a higher pressure than the reference value.

Wherein the first on-off valve is disposed adjacent to the inlet of the pressure reducing valve and is configured to interrupt the flow of the cutting oil flowing into the pressure reducing valve by the opening and closing operation of the pressure reducing valve, And the flow of the coolant flowing into the bypass line is interrupted by the opening and closing operation.

Wherein the booster unit includes a pulsation valve installed in a coolant supply line for boosting a supply pressure of the coolant to a pulsation pressure, a bypass line bypassing the pulsation valve to supply a coolant of a low pressure to the coolant supply line, And an open / close valve installed in the bypass line for interrupting the flow of the coolant flowing into the bypass line. When the internal pressure of the coolant supply passage is detected by the pressure sensor to exceed the set value, And pressurizes the supply pressure to a pulsation pressure that smoothly discharges the chips. Here, the feed pump means a low-pressure pump for pumping the coolant to the pressure of the reference value.

The pulsation valve includes a low pressure side inflow line of the coolant supply line and an air pressure tank installed in the high pressure side outflow line, a first valve body provided at a portion where the air pressure tank and the low pressure side inflow line are connected to each other, Wherein the first valve body is installed to be elastically supported by a first elastic member, the second valve body is installed to be elastically supported by a second elastic member, A pressure sensor for detecting a pressure increase is installed in the valve body to detect that the cutting oil is pressurized to a pulsating pressure that smoothly discharges chips.

In addition, the pulsation valve is provided with a film dividing into an upper portion and a lower portion inside the upper portion of the pneumatic tank, and a third elastic member is provided to elastically support the upper surface of the film, And an adjusting screw is provided for adjusting the degree of pressurization.

Another aspect of the present invention is to provide a coolant supply method for preventing clogging of a chip in machining of a chip to prevent clogging of chips generated during deep hole machining in the machining process, , The coolant supply pressure is boosted to the pulsation pressure at which the discharge of the chips is smooth.

The cutting fluid supply method according to another embodiment of the present invention determines whether or not the internal pressure of the cutting oil supply passage exceeds a first set value and when the internal pressure of the cutting oil supply passage exceeds the first set value, And controls the feed rate and the number of revolutions of the gun if the inner pressure of the coolant supply passage is within the range between the first set value and the second set value, And when the internal pressure of the coolant supply passage exceeds the second set value, the coolant supply pressure is supplied as the pressure increase or the pulsation pressure.

The internal pressure of the coolant supply passage means a pressure applied to the chip discharge groove of the gun drill and a pressure of the coolant supply passage communicated with the chip discharge groove and the first set value is set to a predetermined ratio And the second set value means a pressure higher than the first set value.

For example, the first set value is a pressure when the chip is discharged more smoothly than 10 to 20% of the reference value and less than 50% of the reference value, and the second set value means a pressure exceeding 50% of the reference value do. The first set value and the second set value may vary depending on the diameter of the gun drill and the processing conditions, so that the operator can arbitrarily change and set it based on the data obtained in the preliminary experiment.

According to the present invention, when the inner pressure of the coolant supply passage becomes higher than the set value due to the chip clogging due to the chip not being smoothly discharged through the chip discharge groove of the gudrill during the deep hole machining, It is possible to prevent the chip clogging phenomenon from occurring and increase the supply efficiency of the coolant oil. As a result, the cooling and lubrication by the coolant and the lubrication It is possible to improve the function and to prevent breakage of the cutting tool, that is, the machining tool, and to improve the machining accuracy and productivity.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram showing a cutting-fluid supply device for preventing chip clogging in a gouging process according to a first embodiment of the present invention; FIG.
FIG. 2 is a configuration diagram showing a coolant supply device for preventing chip clogging in a gouging process according to a second embodiment of the present invention.
FIG. 3 is a view showing a pulsation valve applied to a coolant supply device for preventing chip clogging in a grudging process, which is a second embodiment of the present invention.
FIG. 4 is a view showing another embodiment of the pulsation valve of FIG. 3. FIG.
5 is a flowchart schematically showing a method of supplying coolant for preventing chip clogging in a gouging process according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For reference, the size, line thickness, and the like of the components shown in the drawings referred to in describing the present invention may be somewhat exaggerated for ease of understanding. The terms used in the description of the present invention are defined in consideration of the functions of the present invention, and thus may be changed depending on the user, the intention of the operator, customs, and the like. Therefore, the definition of this term should be based on the contents of this specification as a whole.

1 and 2, a generally touch machine 10 includes a main shaft 11, a spindle 12 rotatably installed in the main shaft 11, A grip or the like detachably mounted on the tool holder 13; a support or dust guard 16 for supporting the handle 15; And a table unit 17 on which a work piece 14 to be processed is set.

A tip 15a is provided at the tip of the body 15b and a chip discharge groove 15c for discharging the chip is formed on the outer side of the body 15b. Is provided with a coolant supply passage 18 in the longitudinal direction thereof. A chip box 16a for receiving chips discharged from the chip discharge groove 15c of the gun drill 15 is disposed in the table unit 17 near the workpiece 14. The chip generated by the tip 15a of the gun drill 15 is ejected along the chip ejection groove 15c and is ejected from the workpiece 14 to the chip box 16a through the guide bushing 16b of the chip box 16a. Respectively.

A rotary union 19 is also provided at the rear end of the spindle 12. The rotary union 19 is connected to a coolant supply passage 18. Since the coolant supply passage 18 is connected to the coolant supply line 21 through the rotary union 19, the coolant can be supplied to the coolant supply passage 18 despite the rotation of the spindle 12. The coolant supply passage 18 is collectively referred to as a passage through which the coolant formed in the spindle 12 of the main shaft 11 and the tool holder 13 and the gasket 15 flows.

As shown in Figs. 1 and 2, the cutting oil supply device 20 in the gauntlet processing according to the present invention includes a cutting oil supply line 21 sealingly connected to the cutting oil supply passage 18, A supply pump 22 installed in the coolant storage tank 21 for pumping coolant stored in the coolant storage tank 22a, a pressure sensor 23 for detecting the internal pressure of the coolant supply passage 18, Up unit 25 for increasing the supply pressure of the cutting oil passing through the cutting oil supply line 21 to a high pressure or a pulsation pressure when the internal pressure of the cutting oil supply passage 18 exceeds the set value, 23 for controlling the operation of the voltage step-up unit 25 and the voltage step-up unit 25 are electrically connected to each other.

The coolant supply line 21 is connected from the coolant reservoir 22a to the coolant supply passage 18 of the machine 10. The coolant supply line 21 and the coolant supply passage 18 are connected to the rotary union 19, As shown in Fig.

The supply pump 22 is installed in the cutting oil supply line 21 and the supply pump 22 is installed on the upstream side of the cutting oil supply line 21 adjacent to the cutting oil storage tank 22a and stored in the cutting oil storage tank 22a And supplies the coolant to the coolant supply line 21 by pumping the coolant.

1, the pressure sensor 23 is installed in the coolant supply line 21 at a position as close as possible to the coolant supply passage 18, so that the internal pressure IP of the coolant supply passage 18 is set in real time Should be detectable. In other words, it is preferably installed in the coolant supply line 21 at a position close to the rotary union 19.

The chip generated by the gasket 15 is guided to the gasket 15 when performing deep processing on the workpiece 14 with the gasket 15 in a state where the internal pressure IP of the coolant supply passage 18 is detected in real time. The internal pressure IP of the coolant supply passage 18 detected by the pressure sensor 23 is formed to be equal to or less than the set value.

In other words, when the chip is smoothly discharged during the deep hole processing as described above, the cutting oil is normally supplied into the coolant supply passage 18 and normally discharged through the chip discharge groove 15c of the gun drill 15. At this time, Is maintained at the pressure between the reference value R or the reference value R and the set value which is less than the set value. Here, 'reference value (R)' refers to the preset internal pressure according to the cutting condition at the coolant supply pressure at which the chip is smoothly discharged.

If the chips generated during the deep hole processing can not be smoothly discharged, the chip discharge groove 15c is blocked, that is, the chip discharge groove 15c from the tip 15a of the gun handle 15, The internal pressure IP of the coolant supply passage 18 detected by the pressure sensor 23 exceeds the set value as the pressure in the coolant supply passage 18 communicated with the coolant supply passage 15c rises.

At this time, when the internal pressure IP of the coolant supply passage 18 detected by the pressure sensor 23 exceeds the set value, the pressure increasing unit 25 detects the coolant supply pressure (pressure) supplied through the coolant supply line 21 SP) is instantaneously boosted or pulsating pressure is applied to supply cutting fluid in the shape of a shock wave.

Since the pressure sensor 23 and the voltage step-up unit 25 are electrically connected to the control unit 24, the internal pressure IP of the coolant supply passage 18 detected by the pressure sensor 23 is set to the set value, The control unit 24 controls the step-up unit 25 to smoothly perform the chip discharge with the ripple pressure obtained by repeatedly supplying and interrupting the high-pressure cutting oil to the coolant supply passage 18.

Particularly, the monitoring unit 24a is electrically connected to the control unit 24, and the pressure sensor 23 is electrically connected to the monitoring unit 24a. Because of this, since the internal pressure IP of the coolant supply passage 18 detected by the pressure sensor 23 is transmitted to the monitoring portion 24a in real time, the operator can set the internal pressure IP of the coolant supply passage 18 ) Can be monitored in real time to determine whether the pressure of the cutting oil is increased with respect to the supply pressure. If necessary, the control program can be used to automate the process.

1, the pressure increasing unit 25 according to the first embodiment includes a pressure reducing valve 31 installed in a cutting oil supply line 21 for reducing the pressure of high-pressure cutting oil, A bypass line 26 connected to the coolant supply line 21 for supplying a high-pressure cutting fluid and a bypass line 26 connected to the first and second open / close valves 27a and 27b installed in the coolant supply line 21 and the bypass line 26, 27b.

The supply pump 22 should be a high pressure pump that pumps the coolant at a higher pressure than the reference value R and the pressure reducing valve 31 is installed at the coolant supply line 21. [ When the pressure sensor 23 detects that the internal pressure IP of the coolant supply passage 18 is less than the set value (i.e., the chip is smoothly discharged), the pressure reducing valve 31 is set to the 'reference value R' The pressure of the higher-pressure cutting fluid is reduced to the "reference value R". Here, 'reference value R' means a cutting oil supply pressure SP in a machining state in which chip discharge caused by the deep hole machining of the workpiece 14 by the gun drill 15 is smooth.

For example, if a high-pressure pump is applied in which the coolant supply pressure, that is, the reference value R is about 30 bar and the supply pump 22 pumps the coolant at a high pressure of about 50 bar, 31) reduces the coolant supply pressure of 50 bar to the 'reference value (R)' of 30 bar. Here, various known types of pressure-reducing valves may be applied to the pressure-reducing valve 31, so that a detailed description thereof will be omitted.

When the cutting oil is supplied at a high pressure by the feed pump 22, which is a high-pressure pump, in the machining state in which the chips are smoothly discharged during the deep hole processing by the gun drill 15, the pressure- To a reference value R. The pressure of the coolant supply pressure is reduced to a reference value R.

One end of the bypass line 26 is branched at a branch point 21a of the coolant supply line 21 located upstream of the pressure reducing valve 31 and the other end of the bypass line 26 is connected to a coolant supply line (21b) of the connecting member (21). When the pressure sensor 23 detects that the internal pressure IP of the coolant supply passage 18 exceeds the set value (a state in which chip discharge is not smooth), the supply pump 22, which is a high- Pressure cutting fluid is bypassed without passing through the pressure reducing valve 31 and supplied to the coolant supply passage 18 of the machine 10 through the bypass line 26. [

The first on-off valve 27a is provided between the inlet of the pressure reducing valve 31 and the branch point 21a of the cutting oil supply line 21 so that the flow of the cutting oil flowing into the pressure reducing valve 31 is interrupted do. The second on-off valve 27b is installed on the bypass line 26 and interrupts the flow of the coolant flowing into the bypass line 26 by the opening / closing operation.

The first and second open / close valves 27a and 27b may be a manual valve or an electronic valve. In particular, when the first and second open / close valves 27a and 27b are made of an electromagnetic valve, it is preferable that the valve is electrically connected to the control unit 24 so that the opening and closing thereof is automatically controlled according to the detected pressure of the pressure sensor 23.

The operation of the step-up unit 25 according to the first embodiment will be described in detail.

When the deep hole is to be machined in the workpiece 14 with the grinding wheel 15, the grinding wheel 15 is rotationally driven while pumping the high-pressure cutting oil by the feed pump 22, which is a high-pressure pump, Is discharged to the outside together with the cutting oil through the chip discharge groove 15c. When the chip is smoothly discharged to the outside, the internal pressure IP of the coolant supply passage 18 detected by the pressure sensor 23 is maintained at a lower level than the 'set value', that is, the 'reference value R'. When the deep hole processing is performed stably on the workpiece 14, the supply pressure of the coolant supplied through the coolant supply line 21 is reduced to the 'reference value R' through the pressure reducing valve 26 to be supplied to the coolant supply passage 18).

When the stable deep hole work is continuously performed and the chip is not smoothly discharged, the chips are buried in the chip discharge groove 15c of the gun 15 and the tip 15a of the gun 15 is closed. The inner pressure IP of the coolant supply passage 18 detected by the pressure sensor 23 is smaller than the reference value R because the coolant supply passage 18 communicating with the chip discharge groove 15c is blocked It exceeds the set value.

At this time, the first on-off valve 27a is closed and the second on-off valve 27b of the bypass line 26 is opened, so that the high-pressure cutting oil is supplied to the bypass line 26, The high-pressure cutting fluid is supplied to the spindle 12 and the coolant supply passage 18 of the gasket 15. [ When the high-pressure cutting fluid is supplied to the coolant supply passage 18, the high-pressure cutting oil is discharged from the gun drill 15 to the machining area of the tip of the gun 15 and the tip 14a, So that the chip starts to be smoothly discharged to the outside through the chip discharge groove 15c of the gasket 15.

As shown in FIG. 2, the pressure-rising unit 25 according to the second embodiment includes a pulsation valve 35 installed in the cutting oil supply line 21 for increasing the supply pressure of the cutting oil to an instantaneous high pressure, A third on-off valve 29a provided in front of the first on-off valve 35 and a by-pass valve 29a connected to the cut-off oil supply line 21 to bypass the pulsation valve 35 and the third on-off valve 29a to supply low- Line 28 and a fourth open / close valve 29b provided in the bypass line 28. [

The feed pump 22 is a low pressure pump for pumping coolant to the internal pressure of the reference value R, that is, the low pressure, and the pulsation valve 35 is installed in the coolant supply line 21. When the pressure sensor 23 detects that the internal pressure of the coolant supply passage 18 exceeds the set value (that is, the machining state in which the discharge of the chips is not smooth), the pulsation valve 35 sets the 'reference value R' The supply pressure of the low-pressure cutting fluid must be increased to 'instantaneous pulsation pressure at which the chip is smoothly discharged'. Here, the 'reference value R' refers to the coolant supply pressure SP at a machining condition that smoothly discharges chips generated during deep hole machining of the workpiece 14 by the gun drill 15.

For example, when the chip is discharged under a smooth machining condition and the reference value R is about 30 bar and the feed pump 22 is applied as a low pressure pump for pumping about 30 bar of cutting oil, the pulsation valve 35 supplies a coolant supply of 30 bar It is preferable that the pressure is increased to 50 bar which is an instantaneous pulsation pressure at which the discharge of the chips is smooth.

In this way, when the deep hole is machined by the gun drill 15, when the chip is not smoothly discharged, the low-pressure cutting fluid supplied by the supply pump 22, which is a low-pressure pump, The internal pressure IP is increased and the pressure is increased by the pressure sensor 23 so that the internal pressure IP of the coolant supply passage 18 exceeds the set value , The pulsation valve 35 boosts the supply pressure of the cutting oil to the instantaneous pulsation pressure at which the discharge of the chips is smooth.

One end of the bypass line 28 is branched at a branch point 21a of the coolant supply line 21 located upstream of the pulsation valve 35 and the other end of the bypass line 28 is connected to a coolant supply line (21b) of the connecting member (21). When the pressure sensor 23 detects that the internal pressure IP of the coolant supply passage 18 is lower than the set value (i.e., the chip is smoothly discharged), the bypass valve 35 bypasses the bypass valve 35, And supplies the low-pressure cutting fluid through the line 28.

The on-off valve 29a is provided on the low-pressure side inflow line 21c of the coolant supply line 21 in front of the pulsation valve 35 so that the flow of the coolant flowing into the pulsation valve 35 is interrupted The on / off valve 29b is installed on the bypass line 28, and controls the flow of the coolant flowing into the bypass line 28 by the opening / closing operation of the on / off valve 29b.

The open / close valves 29a and 29b may be a manual valve or an electronic valve. Particularly, when the open / close valves 29a and 29b are electronic valves, the open / close operation of the valve can be automatically controlled in accordance with the pressure detected by the pressure sensor 23, which is electrically connected to the control unit 24. [

A buffer unit 39 may be provided between the pulsation valve 35 and the feed pump 22 to prevent the impact pressure due to the instantaneous high pressure by the pulsation valve 35 from being transmitted to the feed pump 22 The buffer unit 39 may be an accumulator or the like.

On the other hand, a specific embodiment of the pulsation valve 35 is shown in Fig. The pulsation valve 35 includes an air pressure tank 37 to which the low pressure side inflow line 21c and the high pressure side outflow line 21d of the coolant supply line 21 are connected, And a second valve body 38c provided at an end of the low-pressure-side inlet line 21c, and a fluid hammer mechanism having a first valve body 38a provided at a portion where the first valve body 21c is connected to the first valve body 38c and a second valve body 38c provided at an end of the low- have.

Pressure side inflow line 21c means a portion through which low-pressure cutting fluid pumped by the supply pump 22 as a low-pressure pump passes, and the high-pressure-side inflow line 21d is a portion through which the high- Of the cutting tool.

The pneumatic pressure tank 37 is installed vertically upward at the end of the low pressure side inflow line 21c of the cutting oil supply line 21 and the first valve body 38a is elastically supported by the first elastic member 38b And the second valve body 38c is installed to be resiliently supported by the second elastic member 38d.

The pressure increasing action of the pulsation valve 35 adopting the fluid shock principle will be described in detail.

When the low-pressure cutting oil flows into the end of the low-pressure-side inlet line 21c, the low-pressure cutting oil is filled at the lower end of the pneumatic tank 37 at a predetermined height, but the high- do. Thereafter, when the speed of the cutting oil flowing into the second valve body 38c increases and the speed thereof increases, the second valve body 38c is closed. At this time, a fluid hammer of high pressure is generated, 1 valve body 38a is opened and the air in the air pressure tank 37 is compressed so that the coolant is instantaneously boosted and then flows through the high pressure side outflow line 21d to the coolant supply passage 18 of the machine 10, .

Here, it is assumed that the pneumatic pressure tank 37, the first valve body 38a, the first elastic member 38b, the second valve body 38c, and the second elastic member 38d cool the low- It is desirable to design a high-pressure fluid hammer sufficient to raise the pressure to the instantaneous high-pressure pulsation pressure.

The low pressure side inflow line 21c adjacent to the pneumatic tank 37 is provided with a pressure increase sensor 32 for detecting the pressure of the cutting oil in the pneumatic pressure tank 37 to the instantaneous high pressure which is the pulsation pressure And the pressure sensor 36 for sensing the pressure is connected to the monitoring unit 24a so that the pressure of the pressure sensor 36 for sensing the pressure increase can smoothly discharge the chips. And whether or not it is boosted to the instantaneous high pressure '.

4 is a view showing another embodiment of the pulsation valve applied to the apparatus of the present invention. The pulsation valve 35 is provided with a membrane 40 which is hermetically maintained so as to be divided into an upper portion and a lower portion inside the upper portion of the pneumatic tank 37 and is provided with a third An elastic member 41 is provided and an adjusting screw 42 for adjusting the degree of pressing of the third elastic member 41 in the direction of the center line is provided on the upper portion of the air pressure tank 37.

3 is operated in the same manner as the pulsating valve of FIG. 3, but the pulsation valve of FIG. 3 obtains a high pressure only by the air pressure above the air pressure tank 37, and the pulsation valve of FIG. The elastic force of the third elastic member 41 can be added to obtain a higher pressure.

In other words, as soon as the first valve body 38a of the pulsation valve 35 is opened, the third elastic member 41 is compressed along with the air compression on the air pressure tank 37, and the air compression energy and the elastic member compression energy The first valve body 38a is closed by the first elastic member 38b and the pulsation pressure instantaneously boosted to the high pressure side outlet line 21d is discharged. At this time, the discharge pressure is as high as the compression energy of the elastic member added to the air compression energy.

When the discharge pulsation pressure is to be adjusted, the adjustment screw 42 is rotated to adjust the degree of pressing of the third elastic member 41 so that the pulsation pressure suitable for the gouging process can be obtained.

Fig. 5 is a flowchart showing a method of supplying coolant using a coolant supply device in the gauntlet processing of the present invention.

The method of supplying cutting fluid in the gauntlet machining according to the present invention determines whether or not the pressure detected by the pressure sensor 23 exceeds the first set value P1 and the pressure detected by the pressure sensor 23 If it is determined that the pressure is within the range between the first set value P1 and the second set value P2 when the first set value P1 is exceeded, the pressure detected by the pressure sensor 23 is set to the first set value P1 (T3), the pressure detected by the pressure sensor 23 suddenly rises and the second set value P2 is set to the second set value P2, (T4). If the pressure exceeds the second set value P2 by the pressure sensor 23, the coolant supply pressure is boosted or instantaneously boosted and supplied (T5).

The first set value P1 is an excess pressure higher by a predetermined ratio than the reference value R when the chip is smoothly discharged and the second set value P2 is a first set value P1, Which means higher pressure. For example, the 'first set value P1' is a pressure when the chip is discharged more smoothly than 10% to 20% of the 'reference value R' and less than 50% of the 'reference value R' , And the 'second set value P2' means a pressure exceeding 50% of the 'reference value R'. Here, the 'first set value P1' and the second set value P2 'may vary according to the diameter of the gun drill and the machining condition, so that the operator can arbitrarily change the setting based on the data obtained in the preliminary experiment.

The feed speed and the number of revolutions control step T3 of the gun 15 are adjusted so as to reduce the feed speed and the number of revolutions of the gun 15 when the ejection of the chips is not smooth.

The step of increasing the coolant supply pressure (T5) supplies the coolant supply pressure as a boosting pressure or an instantaneous step-up pulsation pressure by any one of the coolant supply methods according to the preceding first and second embodiments.

Further, in the present invention, when the pressure relief valve is provided on the supply pump side of the gudryon machine, the pressure sensor 23 detecting the internal pressure of the coolant supply passage may deteriorate the detection capability of pressure rise due to chip clogging. In this case, when the chip discharging groove is blocked by the chip, it is possible to obtain a function and effect similar to those of the present invention by substituting a flow sensor capable of detecting that the cutting oil is not supplied through the coolant supply passage or the supply flow rate is reduced.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

10: Machine to be touched 11: Spindle 12: Spindle
14: Material 13: Tool holder 15:
16: discharge port 17: table unit 18: coolant supply passage
20: coolant supply device 21: coolant supply line 22: supply pump
23: pressure sensor 24: control unit 24a:
25: step-up unit 35: pulsation valve 37: air pressure tank

Claims

As a coolant supply device for preventing chip clogging in the process of machining to prevent clogging of chips to facilitate chip discharge during deep hole processing by gun drill,
A supply pump connected to the coolant supply passage, a supply pump installed in the coolant supply line for pumping coolant stored in the coolant storage tank, a pressure sensor for detecting the internal pressure of the coolant supply passage, A pressure increasing unit for increasing the supply pressure of the cutting oil passing through the cutting oil supply line when the internal pressure of the supply passage exceeds the set value, And a control unit for controlling the operation of the unit.

The method according to claim 1,
And the bypass line is connected to the coolant supply line so as to supply the high-pressure coolant bypassing the pressure reducing valve, and a bypass line connected to the coolant supply line and the bypass line, And the first and second open / close valves, respectively,
Wherein when the internal pressure of the coolant supply passage is detected by the pressure sensor to be equal to or less than the set value, the pressure reducing valve is configured to reduce the pressure of the high-pressure coolant higher than the reference value to a reference value.

The method according to claim 1,
The boosting unit includes an instantaneous pulsation valve installed in the coolant supply line for boosting the supply pressure of the coolant to a high pressure, a bypass line connected to the coolant supply line for supplying the low-pressure coolant bypassing the pulsation valve, And an on-off valve installed in the pass line for interrupting the flow of the coolant flowing into the bypass line,
When the internal pressure of the coolant supply passage exceeds the set value by the pressure sensor, the pulsation valve boosts the supply pressure of the low-pressure cutting oil, which is the reference value, to the high pressure of the instantaneous pulsation pressure, To prevent clogging of the chip in the machining process.

The method of claim 3,
Wherein the pulsation valve is provided with a film dividing into an upper portion and a lower portion inside the upper portion of the pneumatic tank and provided with a third elastic member to elastically support the upper surface of the film, Wherein the adjusting screw is provided for adjusting the amount of the cutting fluid.

The method according to claim 1,
Wherein the pressure sensor is replaced with a flow rate sensor for detecting a flow rate of the coolant in the coolant supply passage.

A method of supplying coolant for preventing chip clogging in touching,
Determines whether the 'internal pressure of the coolant supply passage' exceeds a first set value,
If the 'internal pressure of the coolant supply passage' exceeds the first set value, it is determined whether it is within the range between the first set value and the second set value,
If the 'internal pressure of the coolant supply passage' is within the range between the first set value and the second set value, the feed rate and the number of revolutions of the gasket are adjusted,
Determines whether the " internal pressure of the coolant supply passage " exceeds a second set value,
And when the 'internal pressure of the coolant supply passage' exceeds the second set value, the coolant supply pressure is increased to supply the coolant.
The 'first set value' is an excess pressure higher than the 'reference value' by a predetermined ratio when the chip is smoothly discharged, and the 'second set value' means a pressure higher than the 'first set value'.