JP5103151B2 - Cutting fluid supply device - Google Patents

Description

  The present invention relates to a cutting fluid supply device that supplies a cutting fluid to a machining area of a machine tool.

  When machining, the cutting fluid is often supplied to the contact portion between the workpiece and the tool. This is for cooling the work and the tool to reduce the thermal displacement and preventing the dimensional accuracy from deteriorating or preventing the generation of the constituent cutting edge to obtain a good finished surface.

  For this reason, the machine tool is usually provided with a cutting fluid supply device. The cutting fluid supply device, for example, includes a storage tank in which the cutting fluid is stored, and a cutting fluid in the storage tank. A supply pipe for supplying the machining area, a supply section provided in the supply pipe and configured to supply a cutting fluid, and a recovery section for collecting the cutting liquid supplied to the machining area in the storage tank And the cutting fluid circulates between the storage tank and the processing region.

  However, the circulating cutting fluid rises in temperature by cooling the workpiece and the tool and is returned to the storage tank, and the cutting fluid temperature in the storage tank rises, so that the cooling efficiency of the workpiece and the tool decreases. There has been a problem or a problem that the structure constituting the machine tool is heated by the heated cutting fluid and the temperature rises, and the structure is thermally displaced to reduce the machining accuracy.

  Therefore, conventionally, a cutting fluid supply device including a cooling unit for cooling the cutting fluid in the storage tank has been proposed. In addition, a processing apparatus disclosed in Japanese Patent Application Laid-Open No. 2004-42144 has been proposed. This processing apparatus includes a coolant tank in which coolant is stored, a discharge member that discharges coolant, and a coolant inside. A flow path is formed, and a flow path block having a discharge member connected to one end side of the flow path, a cooling mechanism for cooling the flow path block, and coolant in the coolant tank is supplied to the other end side of the flow path of the cooling member. Piping, a pump provided in the piping, and a recovery unit for recovering the coolant discharged from the discharge member in the coolant tank, and the discharge member, the flow path block, and the cooling mechanism are in the processing region Has been placed.

JP 2004-42144 A

  However, even in the above-described cutting fluid supply apparatus having a cooling unit, when the supply pump is driven, it generates heat and becomes a heat source. Therefore, when the cutting fluid cooled by the cooling unit passes through the supply pump. There is a problem that the temperature rises and the above disadvantages cannot be effectively prevented. Furthermore, although the heat generation amount of the supply pump is low at the beginning of driving, the heat generation amount increases with the passage of time, so that the cutting when passing through the supply pump depends on the elapsed time since the supply pump was driven. The amount of temperature rise of the liquid is different, and there is a problem that it is difficult to control the temperature of the cutting liquid supplied to the machining area.

  Moreover, in the processing apparatus disclosed in Japanese Patent Application Laid-Open No. 2004-42144, since the flow path block and the cooling mechanism are provided in the processing region, they must be made compact and have the ability to cool the coolant. Low. Therefore, when the coolant is discharged from the discharge member at a large flow rate, the coolant is discharged with insufficient cooling, and there is a possibility that the above-described inconvenience may still occur. In addition, there is a problem that the cost is increased in order to achieve compactness.

  The present invention has been made in view of the above circumstances, and can provide a cutting fluid supply device that can prevent a rise in the temperature of the cutting fluid and can cope with the supply of the cutting fluid to a machining area at a large flow rate. Is the purpose.

To achieve the above object, the present invention provides:
A first and a second tank for storing a respective internal cutting fluid,
Supply means for supplying the cutting fluid in the first tank to the machining area of the machine tool;
Recovery means for recovering the cutting fluid supplied to the processing region in the first tank;
It is composed of a cooling means for cooling the cutting fluid of the second tank,
The supply means includes a supply pipe for supplying the cutting fluid to the machining region, and a supply pump provided in the supply pipe ,
Furthermore, the first tank includes a receiving portion that receives the cutting fluid recovered by the recovery means, and a suction portion from which the cutting fluid is sucked out by the supply pump,
The receiving portion of the first tank is connected to the second tank by piping so that the cutting fluid flows from the receiving portion into the second tank, and the suction portion of the first tank is connected to the second tank. Connected to the second tank by piping so that the cutting fluid flows from the tank to the suction part,
A part of the supply pipe on the downstream side in the cutting fluid circulation direction from the supply pump is immersed in the cutting fluid in the second tank, and the downstream portion in the cutting fluid circulation direction is connected to the machining region from the immersion portion. The present invention relates to a cutting fluid supply apparatus.

According to this invention, the cutting fluid in the first tank is supplied to the machining area of the machine tool by the supply pump via the supply pipe, and the supplied cutting fluid is supplied to the receiving portion in the first tank by the recovery means . Collected. The first tank and the second tank have two pipes so that the cutting fluid flows from the receiving portion of the first tank to the second tank, and the cutting fluid flows from the second tank to the suction portion of the first tank. in conjunction provided, since switching cutting liquid in the second tank is cooled Ri by the cooling means, by the temperature elevated cutting fluid is returned to the first tank in the processing region of the first tank The cutting fluid temperature is prevented from rising.

Further, in the present invention, since a part of the supply pipe on the downstream side in the cutting fluid flow direction from the supply pump is immersed in the cutting fluid in the second tank, the cutting fluid whose temperature is increased when passing through the supply pump is When circulating through the immersion portion , the coolant is recooled by the cutting fluid in the second tank and supplied to the processing region.

Therefore, for example, it can prevent that the cooling efficiency of a workpiece | work or a tool falls, or it can prevent that the structure which comprises a machine tool is heated with a cutting fluid, and is thermally displaced, and processing accuracy deteriorates. In addition, by re-cooling the cutting fluid, the temperature of the cutting fluid flowing in the supply pipe can be made substantially the same as the temperature of the cutting fluid in the second tank, so that the temperature control of the cutting fluid supplied to the machining area can be easily performed. Can be done. Furthermore, heat is exchanged between the cooled cutting fluid in the second tank and the cutting fluid flowing in the immersion portion of the supply pipe to cool the cutting fluid in the immersion portion, and the flow path block and the cooling mechanism are There is no request for downsizing as in the conventional arrangement in the processing area. If the pipe shape of the immersion part is set according to the flow rate of the cutting fluid flowing in the immersion part, a large flow rate of cutting fluid is set in the processing area. It is possible to sufficiently cool this even when supplying. Moreover, since only a part of the supply pipe passes through the second tank , the cost does not increase.

The cutting fluid supply device further includes first detection means for detecting the temperature of the structure constituting the machine tool, and second detection means for detecting the temperature of the cutting fluid in the second tank , The cooling means cuts the second tank so that the difference between the temperature detected by the first detection means and the temperature detected by the second detection means is controlled to a preset value. It may be configured to cool the liquid.

In this way, the temperature difference between the machine tool structure and the cutting fluid in the second tank and the immersion portion of the supply pipe, that is, the cutting fluid supplied to the machining area can be controlled to a predetermined value. It is possible to effectively prevent the thermal displacement amount of the machine tool structure from changing due to the change in the temperature of the cutting fluid supplied to the machining area.

  As described above, according to the cutting fluid supply apparatus according to the present invention, it is possible to prevent a rise in the temperature of the cutting fluid and to cope with the case where the cutting fluid is supplied to the machining area at a large flow rate.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of a cutting fluid supply device and the like according to an embodiment of the present invention.

  As shown in FIG. 1, the cutting fluid supply device 1 of this example is provided in a machine tool 10, and a storage tank 21 in which the cutting fluid L is stored and a cutting fluid L in the storage tank 21 are machined. A supply mechanism 25 that supplies the machining area of the machine 10, a recovery mechanism 30 that collects the cutting fluid L supplied to the machining area in the storage tank 21, and a cooling mechanism 35 that cools the cutting fluid L in the storage tank 21. The first detection sensor 40 is provided on the bed 11 of the machine tool 10 and detects its temperature, and the second detection sensor 41 detects the temperature of the cooled cutting fluid L.

  The machine tool 10 includes, for example, a bed 11, a column 12 fixed on the bed 11, a spindle head 13 supported by the column 12 so as to be movable in the vertical direction, and a spindle head 13 about the axis. The main shaft 14 that is rotatably supported and holds the tool T, the saddle 15 that is provided on the bed 11 so as to be movable in the horizontal direction, and the saddle 15 that is provided so as to be movable in a horizontal direction perpendicular to the moving direction. , The table 16 on which the workpiece W is placed, and the nozzle body 17 which is disposed at the tip of the spindle head 13 and discharges the cutting fluid L toward the contact portion between the tool T and the workpiece W. The spindle head 13, the saddle 15, the table 16, and the nozzle body 17 are arranged in the machining area. Further, a flow path 13 a for the cutting fluid L connected to the nozzle body 17 is formed in the spindle head 13.

  The storage tank 21 is set as a region where the cutting fluid L collected by the collecting mechanism 30 is received and a region where the supply pump 27 of the supply mechanism 25 sucks the cutting fluid L at a position spaced from the receiving portion 21a. And a cooling part 21c set as a region for cooling the cutting fluid L stored in the cooling mechanism 35 at a position spaced from the receiving part 21a and the suction part 21b. The cutting fluid L flows from the receiving portion 21a side (upstream side) to the suction portion 21b side (downstream side) via the cooling portion 21c.

  The storage tank 21 includes a first tank 22 and a second tank 23 that communicate with each other. The first tank 22 is disposed, for example, at a lower portion of the bed 11 and includes the receiving portion 21a and the suction portion 21b. For example, the second tank 22 is disposed adjacent to the first tank 22 and functions as the cooling unit 21c.

  The first tank 22 and the second tank 23 are connected by a pipe 21d through which the cutting liquid L flows toward the second tank 23 and a pipe 21e through which the cutting liquid L flows toward the first tank 22 side. ing. Further, a filter 22 a for removing chips generated by machining with the machine tool 10 is disposed in the first tank 22 on the downstream side of the receiving portion 21 a in the cutting fluid flow direction. The second detection sensor 41 is disposed in the second tank 23.

  The supply mechanism 25 includes a supply pipe 26 for supplying the cutting fluid L in the first tank 22 to the nozzle body 17, and a supply pump 27 provided in the supply pipe 26 for supplying the cutting fluid L to the nozzle body 17. With. One end of the supply pipe 26 is connected to the suction portion 21 b, the other end is connected to the flow path 13 a of the spindle head 13, and a part of the supply pipe 27 on the downstream side in the cutting fluid circulation direction is the second part. It is immersed in the cutting fluid L in the tank 23. Reference numeral 26a indicates a portion of the supply pipe 26 immersed in the cutting fluid L. A plurality of fins 26 b are provided on the outer peripheral surface of the immersion part 26 a of the supply pipe 26.

  The recovery mechanism 30 is provided on the bed 11 so as to be disposed below the processing region, and a receiving member 31 that receives the cutting fluid L discharged from the nozzle body 17, one end at the receiving member 31, and the other end at the other end. A recovery pipe 32 is connected to the receiving portion 21 a and recovers the cutting fluid L discharged from the nozzle body 17 into the first tank 22.

  The cooling mechanism 35 includes a coiled cooling pipe 36 disposed in the second tank 23, a cooling fluid supply device 37 that supplies and circulates a cooling fluid in the cooling pipe 36, and an operation of the cooling fluid supply device 37. And a control device 38 for controlling. The control device 38 is a value in which the difference between the temperature of the bed 11 detected by the first detection sensor 40 and the temperature of the cutting fluid L in the second tank 23 detected by the second detection sensor 41 is set in advance. For example, the temperature and flow rate of the cooling fluid supplied into the cooling pipe 36 are controlled.

  According to the cutting fluid supply apparatus 1 of the present example configured as described above, the cutting fluid L in the first tank 22 is supplied to the nozzle body of the machine tool 10 by the supply pump 27 via the supply pipe 26 and the flow path 13a. 17 and discharged from the nozzle body 17 toward the contact portion between the tool T and the workpiece W.

  Then, the discharged cutting fluid L is returned to the first tank 22 by the receiving member 31 and the recovery pipe 32. The recirculated cutting fluid L flows from the receiving portion 21a side toward the suction portion 21b side. At this time, chips are removed by the filter 22a and cooled in the second tank 23 to reach the suction portion 21b. . The cutting fluid L in the second tank 23 is set so that the difference between the temperature detected by the first detection sensor 40 and the temperature detected by the second detection sensor 41 by the cooling mechanism 35 becomes a predetermined value. To be cooled. As a result, the cutting fluid whose temperature has increased due to the cooling of the workpiece W and the tool T is returned to the storage tank 21, thereby preventing the temperature of the cutting fluid supplied to the nozzle body 17 from increasing.

  In the cutting fluid supply apparatus 1 of this example, as described above, a part of the supply pipe 26 on the downstream side in the cutting fluid circulation direction from the supply pump 27 (portion indicated by reference numeral 26a) is in the second tank 23. Since the cutting fluid L is immersed in the cutting fluid L, the second tank 23 is used when the cutting fluid L cooled in the second tank 23 circulates in the immersion portion 26a even if the temperature rises when passing through the supply pump 27. It is recooled by the cutting fluid L and supplied to the nozzle body 17. In addition, the cutting fluid L which distribute | circulates the inside of the immersion part 26a is cooled efficiently by the several fin 26b.

  Therefore, for example, the cooling efficiency of the workpiece W or the tool T is prevented from being lowered, or the structure (for example, the bed 11) of the machine tool 10 is heated by the cutting fluid L to be thermally displaced, so that the machining accuracy is deteriorated. Can be prevented. Further, by re-cooling the cutting fluid L, the temperature of the cutting fluid L flowing through the supply pipe 26 can be made substantially the same as the temperature of the cutting fluid L in the second tank 23, so that it is supplied to the nozzle body 17. The temperature control of the cutting fluid L can be easily performed. Furthermore, heat is exchanged between the cooled cutting fluid L in the second tank 23 and the cutting fluid L flowing in the immersion portion 26a of the supply pipe 26 to cool the cutting fluid L in the immersion portion 26a. The flow path block and the cooling mechanism are arranged in the machining area, and there is no request for downsizing, and the shape of the immersion part 26a is determined according to the flow rate of the cutting fluid L flowing through the immersion part 26a. If set, it is possible to sufficiently cool the nozzle body 17 even when a large flow rate of the cutting fluid L is supplied. Further, since the supply pipe 26 only passes through the second tank 23, the cost does not increase.

  Moreover, since the cutting fluid L is cooled so that the temperature difference between the bed 11 and the cutting fluid L in the second tank 23 becomes a predetermined value, the bed 11 and the cutting fluid L discharged from the nozzle body 17 The temperature difference can be controlled to a predetermined value, and the thermal displacement amount of the bed 11 can be effectively prevented from changing due to the change in the temperature of the cutting fluid L discharged from the nozzle body 17.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect which this invention can take is not limited to this at all.

  In the above example, the storage tank 21 is composed of the first tank 22 and the second tank 23, but is not limited thereto, and may be composed of one tank (only the first tank 22). In this case, the cooling pipe 36 is arranged between the filter 22 a and the suction part 21 b in the cutting fluid flow direction, and the immersion part 26 a of the supply pipe 26 is arranged in the vicinity of the cooling pipe 36. Even if it does in this way, since the cutting fluid L which distribute | circulates the inside of the immersion part 26a is cooled with the cutting fluid L of the cooling pipe 36 vicinity, the effect similar to the above can be acquired.

  Further, the pipe 21e is omitted and the supply pipe 26 is connected to the second tank 23 side so that the cutting fluid L flows into and is stored in the second tank 23 from the first tank 22 via the pipe 21d. The cutting fluid L in the second tank 23 may be supplied to the nozzle body 17 through the immersion pump 26 a in the second tank 23 by the supply pump 27.

  Moreover, the shape of the immersion part 26a of the supply pipe 26 may be any shape, and is not particularly limited. Further, the fins 26b may be provided on the inner peripheral surface instead of the outer peripheral surface of the immersion part 26a, or may be provided on both the outer peripheral surface and the inner peripheral surface. Note that the fins 26b are not necessarily provided.

  Even if the control device 38 performs control so that the temperature detected by the first detection sensor 40 and the temperature detected by the second detection sensor 41 are the same (the temperature difference is zero), the detection by the first detection sensor 40 is performed. Even if the temperature is controlled to be higher than the temperature detected by the second detection sensor 41 (temperature difference is + 1 ° C., for example), the temperature detected by the first detection sensor 40 is lower than the temperature detected by the second detection sensor 41. (The temperature difference may be −1 ° C., for example).

It is sectional drawing which showed schematic structure, such as a cutting fluid supply apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting fluid supply apparatus 10 Machine tool 11 Bed 17 Nozzle body 21 Storage tank 21a Receiving part 21b Suction part 21c Cooling part 22 1st tank 23 2nd tank 25 Supply mechanism 26 Supply pipe 27 Supply pump 30 Recovery mechanism 31 Receiving member 32 Recovery Tube 35 Cooling mechanism 36 Cooling tube 37 Cooling fluid supply device 38 Control device 40 First detection sensor 41 Second detection sensor

Claims (2)

A first and a second tank for storing a respective internal cutting fluid,
Supply means for supplying the cutting fluid in the first tank to the machining area of the machine tool;
Recovery means for recovering the cutting fluid supplied to the processing region in the first tank;
It is composed of a cooling means for cooling the cutting fluid of the second tank,
The supply means includes a supply pipe for supplying the cutting fluid to the machining region, and a supply pump provided in the supply pipe ,
Furthermore, the first tank includes a receiving portion that receives the cutting fluid recovered by the recovery means, and a suction portion from which the cutting fluid is sucked out by the supply pump,
The receiving portion of the first tank is connected to the second tank by piping so that the cutting fluid flows from the receiving portion into the second tank, and the suction portion of the first tank is connected to the second tank. Connected to the second tank by piping so that the cutting fluid flows from the tank to the suction part,
A part of the supply pipe on the downstream side in the cutting fluid circulation direction from the supply pump is immersed in the cutting fluid in the second tank, and the downstream portion in the cutting fluid circulation direction is connected to the machining region from the immersion portion. A cutting fluid supply apparatus comprising: First detection means for detecting the temperature of a structure constituting the machine tool;
A second detection means for detecting the temperature of the cutting fluid in the second tank ;
The cooling means cuts the second tank so that the difference between the temperature detected by the first detection means and the temperature detected by the second detection means is controlled to a preset value. The cutting fluid supply device according to claim 1, wherein the cutting fluid supply device is configured to cool the fluid.

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