JPWO2019049227A1 - Machine Tools - Google Patents

Abstract

A processing device that performs processing on a workpiece held by a spindle chuck with a tool, a discharge device that discharges chips generated by processing the work, an input port that guides falling chips into the discharge device, and an input port. A chip input section having a guide table inclined toward a mouth, and a plurality of nozzles for jetting a coolant to a processing point of a work and upper upper side portions of the guide table, and a coolant jetted from the plurality of nozzles To a tank, and a coolant device that repeats supply to the plurality of nozzles by a pump, and a control device that is provided with an electromagnetic valve for each of the plurality of nozzles and controls opening and closing of each of the electromagnetic valves And a machine tool having

Description

  The present invention relates to a machine tool having an inclined guide table for feeding dropped chips to a discharge device, and allowing coolant to flow into the guide table from both left and right sides.

  In the machining chamber of the machine tool, coolant is blown out to the machining point, and lubrication for cutting and the like and washing of chips are performed. Further, a discharge conveyor is installed in the machine tool as a chip discharge device, and chips entering the storage tank are sent out of the machine. For this reason, an inlet to the storage tank is provided below the processing point, and chips and coolant that have fallen are collected in the storage tank. The outside of the insertion port is configured so that chips that did not directly enter the insertion port are poured with a coolant. For example, as a machine tool in which chips are washed away by using a coolant, those disclosed in Patent Documents 1 and 2 below can be cited.

  In particular, the conventional example of the document discloses a machine tool that ejects coolant from a plurality of locations. Patent Literature 1 discloses a configuration in which a part of a plurality of cleaning locations is switched between ON and OFF with respect to the ejection of coolant. In other words, a configuration is described in which a coolant is constantly or for a long time supplied to a cleaning location where chips are likely to accumulate, and a short time is supplied to a cleaning location where the amount of deposited chips is relatively small. On the other hand, Patent Document 2 discloses a configuration in which a relief valve or the like is used, the valve is opened when the pressure of coolant in a pipe reaches a certain value, and the coolant is blown out at a pressure higher than usual. ing.

JP 2007-030109 A JP 2015-080830 A

  By the way, if the flow of the coolant is monotonous at the cleaning location, the chips at the location where the flow is weak tend to remain without flowing. Then, the remaining chips will further impede the flow, and the chips will accumulate. In the case of the above-mentioned conventional example, the flow of the coolant is changed by ON / OFF of the valve or the like. Will happen. On the other hand, an inclined guide table for dropping chips is provided near the inlet of the discharge conveyor. Then, a coolant is caused to flow on the guide table surface in order to surely guide the chips to the inlet. However, if the flow of the coolant becomes monotonous as in the conventional example, the chips at the locations where the flow is weak cannot be sent to the inlet and are left on the guide table. This is especially true when a large inclination cannot be provided to the guide table, and chips tend to accumulate.

  Therefore, an object of the present invention is to provide a machine tool that switches the range of a flow on a guide table in order to solve such a problem.

  A machine tool according to one embodiment of the present invention includes a processing device that performs processing on a workpiece held by a spindle chuck with a tool, a discharge device that discharges chips generated by processing the work, and a discharge device that discharges falling chips inside the discharge device. A chip inlet having a guide table inclined toward the inlet, and a plurality of nozzles for injecting a coolant into a work point of a work and upper upper side portions of the guide table. A coolant device that collects coolant ejected from the plurality of nozzles into a tank and repeats supply to the plurality of nozzles by a pump, and the plurality of nozzles each include an electromagnetic valve, A control device for controlling the opening and closing of each of the valves.

  According to the configuration, the electromagnetic valves are provided in the plurality of nozzles for ejecting the coolant in the machine tool, and the opening and closing of the electromagnetic valves are controlled. Therefore, the opening and closing of the electromagnetic valves of the nozzles provided on the guide table are switched. Thereby, the range of the flow of the coolant flowing through the guide table is changed, so that the weak flow where the chips are easily accumulated can be eliminated to efficiently flow the chips to the inlet.

FIG. 2 is a side view showing an internal structure of the embodiment of the machine tool. It is the figure which showed the machine body cover front part to which the 2nd nozzle and the 3rd nozzle were attached from the processing chamber side. FIG. 7 is a cross-sectional perspective view of a body cover front part showing a second nozzle side. 4 is a schematic diagram illustrating a first pattern of coolant flowing on a guide table. 5 is a schematic diagram illustrating a second pattern of coolant flowing on a guide table. FIG. 4 is a diagram illustrating an example of switching control of first to third solenoid valves.

  Next, an embodiment of a machine tool according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an internal structure of an embodiment of a machine tool. The machine tool 1 has a processing module 5 mounted on a base 2 and is entirely covered by a body cover (not shown). The processing module 5 is provided on the movable bed 3 having wheels, and is configured to be able to move on the base 2 along the rail in the longitudinal direction of the machine.

  The machine tool 1 is a turret lathe including a tool table 15 on which a rotating tool such as an end mill or a drill or a cutting tool such as a cutting tool is mounted. The machine tool 1 is a two-axis lathe, and moves a cutting tool or the like mounted on a tool base 15 in a Z-axis direction and an X-axis direction with respect to a work W held by a spindle chuck 13 of a headstock 12. There is provided a driving mechanism for causing the driving mechanism. Note that the Z-axis direction is a machine body front-rear direction parallel to the rotation axis of the headstock 12. The X-axis direction is the vertical direction of the aircraft, and the Y-axis direction is the lateral width direction of the aircraft.

  In the machining module 5 of the machine tool 1, a headstock 12 is fixed on the movable bed 3. The headstock 12 is provided with a spindle chuck 13 at the front side of the machine body with respect to the rotating spindle. For example, at the time of machining, the work W conveyed by the autoloader is attached and detached. On the movable bed 3, a column 18 is erected in the body width direction near the headstock 12, and an X-axis drive device 16 and a Z-axis drive device 17 are assembled to the column 18. The turret device 14 is movable in the X-axis direction and the Z-axis direction by each of the driving devices.

  In the machine tool 1, the tool on the tool base 15 is selected by turning indexing of the turret device 14, and the X-axis driving device 16 and the Z-axis driving device 17 are driven to set the tool in a predetermined position in the X-axis direction and the Z-axis direction. The transfer to is performed. Then, in the headstock 12, the work W held by the spindle chuck 13 is rotated, and a tool is applied to the work W to perform cutting or boring. At that time, a coolant is sprayed to the processing point in the processing chamber 6 of the machine tool 1 to perform lubrication for the processing, chip washing, and the like.

  The coolant is sprayed at a processing point where the tool hits the workpiece W, and is also flown below the processing point in order to discharge chips from inside the machine. In the machine tool 1 of the present embodiment, a storage tank 22 capable of storing chips and coolant is provided inside the base 2, and a screw conveyor is incorporated in the storage tank 22 as a discharge device. Therefore, in the machine tool 1, the chips cut from the work W are stored in the storage tank 22, scraped out by the rotation of the screw therefrom, further sent out of the machine body, and collected in the collection box. Has become.

  The machine tool 1 is provided with an inlet 21 for guiding chips into the storage tank 22 below the processing chamber 6. Therefore, the chips cut out from the work W fall together with the coolant and are collected from the inlet 21 into the storage tank 22. At this time, the chips dropped around the inlet 21 are poured into the storage tank 22 by the coolant so that the dropped chips do not remain around the inlet 21. In particular, a guide table 23 is provided at a location where chips are dropped at the front of the inlet 21. Then, a configuration is adopted in which chips dropped on the guide table 23 are flown to the inlet 21 by the coolant.

  By the way, the coolant device of the machine tool 1 is provided with a coolant tank 25 outside the storage tank 22 so that the coolant in the storage tank 22 is sent to the coolant tank 25 in a state where chips are removed. Has become. Further, the coolant device is provided with a tank 26 for storing coolant from which chips and the like have been removed through a filter, and a coolant pipe 28 is connected to the tank 26 via a pump 27. That is, in the coolant device, the coolant that has returned to the coolant tank 25 is regenerated through the filter. Then, the coolant is sent to a processing point or the like by the pump 27, is again stored in the storage tank 22, and returns to the tank 25 for repeated use.

  The pump 27 is arranged on the rear side of the fuselage, and a coolant pipe 28 connected thereto is sent forward through the upper part of the fuselage, and extends to the processing chamber 6 at the front part of the fuselage as shown in the figure. Although not shown, a branch pipe that branches toward the turret device 14 in the middle of the coolant pipe 28 is formed, and a first nozzle is formed ahead of the branch pipe. Then, the coolant flowing through the branch pipe is ejected from the first nozzle, and is ejected to the processing point. On the other hand, the coolant pipe 28 extending to the processing chamber 6 is connected to a second nozzle 32 and a third nozzle 33 attached to the front surface of the machine body cover, as shown in FIGS. That is, the coolant pipe 28 extending toward the front of the fuselage is divided into two branches, and the second nozzle 32 and the third nozzle 33 are connected to the respective ends.

  Here, FIG. 2 is a diagram illustrating a front side of the body cover to which the second nozzle 32 and the third nozzle 33 are attached, as viewed from the processing chamber 6 side. FIG. 3 is a front view of the body cover illustrating the second nozzle side. It is a sectional perspective view of a part. In the machine tool 1, the processing module 5 constituting the processing unit is covered by the machine body cover. FIG. 1 shows a body cover front part 7 and a front cover 8 attached to a front part of the body. The space on the rear side of the machine body cover front part 7 is a processing chamber 6 in which the tool held by the turret device 14 moves and processes the work W held by the spindle chuck 13. A through-hole 701 is formed in the machine body cover front part 7 constituting the processing chamber 6 so that the work W can be taken in and out by an autoloader that moves in the front cover 8, and an opening / closing door 38 that slides up and down is provided. I have.

  A second nozzle 32 and a third nozzle 33 are arranged on the left and right sides on the back side of the body cover front part 7 so as to face downward. The second nozzle 32 and the third nozzle 33 are connected to each of the coolant pipes 28 divided into two via a second solenoid valve 34 and a third solenoid valve 35, respectively. From the downwardly directed second nozzle 32 and third nozzle 33, coolant is blown out onto the upper surface of the guide table 23 located therebelow. As the second nozzle 32 and the third nozzle 33, those having a wide tip shape as shown in FIG. 3 are used so that the coolant flows widely on the upper surface of the guide table 23.

  By the way, since the guide table 23 of the machine tool 1 is attached in a state where the inclination is gentle, chips falling on the guide table 23 may remain without being flushed even when receiving the flow of the coolant. Originally, it is preferable to increase the inclination angle of the guide table 23 to such an extent that the chips themselves slide down under their own weight. However, in the case of the present embodiment, since the machine tool 1 is designed to be compact, The inclination angle of the guide table 23 cannot be made large.

  Specifically, first, the guide table 23 is formed on the machine body cover, and is configured to move integrally with the processing module 5 on the movable bed 3. Therefore, the angle of the guide table 23 cannot be increased so as to protrude downward. Second, there is a through hole 701 on the upper side, and it is necessary to prevent interference with the movement of the opening / closing door 38 provided therein. Therefore, the guide table 23 cannot be extended upward to increase the angle. That is, in the present embodiment, since the upper and lower installation widths of the guide table 23 are limited, it is not possible to make the configuration greatly inclined.

  The guide table 23 has a trapezoidal central portion 231 having a width narrowing toward the input port 21 side, and side portions 232 on both sides in the width direction inclined toward the central portion 231. It is inclined so as to descend toward the inlet 21. Originally, the inclination of the guide table 23 is preferably about 30 degrees in order to facilitate the flow of chips, but in the present embodiment, it is only about 10 degrees. Therefore, chips tend to remain on the guide table 23 at locations where the flow of the coolant is weak. In the present embodiment, a configuration is adopted in which the chips are efficiently poured into the insertion port 21 while the installation of the guide table 23 is restricted.

  The coolant pipe 28 in the processing chamber 6 passes on both sides of the through-hole 701, and the second nozzle 32 and the third nozzle 33 are disposed on the side portion 232 of the guide table 23 and are arranged at a high inclination. Until now, the coolant has been flowing from both the second nozzle 32 and the third nozzle 33 in the same manner. In this case, the flow of the coolant on the guide table 23 spreads symmetrically from both the left and right sides as shown in FIG. And, in the upper part A of the center where the flows overlap, the chips have remained without flowing. It is conceivable that the momentum of the flow to the downstream side has been reduced where the flows overlap. Therefore, even if the flow of the coolant continues, the chips remain in the portion A and become the accumulation points.

  Thus, in the present embodiment, the first to third nozzles 33 of the coolant device are provided with a first solenoid valve, a second solenoid valve 34, and a third solenoid valve 35, respectively. The first to third solenoid valves are on-off valves, and the flow of coolant at each location is switched by each on-off operation. The machine tool 1 is equipped with a control device 19 for controlling each drive device in the processing module 5 (see FIG. 1). In the control device, a machining control program for executing machining of a work and the like are stored in a memory. In the present embodiment, in particular, a coolant control program for controlling opening and closing of each solenoid valve of the coolant device is also stored.

  Here, FIG. 4 is a schematic diagram showing a first pattern of the coolant flowing on the guide table 23. FIG. FIG. 5 is a schematic diagram showing the second pattern in a simplified manner. In the first pattern of FIG. 4, the coolant flows only from the second nozzle 32 by setting the second solenoid valve 34 to the open state and setting the third electric valve to the closed state. Therefore, in the flow of the first pattern, chips near the portion B far from the second nozzle 32 remain without flowing. Therefore, the third solenoid valve 35 is switched to the open state at a predetermined timing, and the state is changed to the second pattern in FIG. 5 in which the coolant flows from both the second nozzle 32 and the third nozzle 33.

  In the flow of the second pattern, the coolant vigorously flows to the portion B, so that the chips remaining there are flushed to the inlet 21. As described above, in the case of the second pattern, chips are likely to remain in the portion A. However, since the flow of the coolant is switched to the first pattern again, chips are injected by vigorous coolant from the second nozzle 32. It is flushed to the mouth 21. Therefore, according to the present embodiment, the range of the coolant flow can be switched between the first pattern and the second pattern, so that a portion where chips easily accumulate can be eliminated.

  By the way, the flow rate of the coolant sent through the coolant pipe 28 depends on the capacity of the pump. Therefore, by ejecting the coolant from the second and third nozzles 32 and 33, the momentum of the coolant ejected from the first nozzle is weakened. Therefore, it is preferable that the switching of the first to third solenoid valves be performed at a timing as shown in FIG. 6, for example. That is, the ON / OFF of the first solenoid valve is switched so that the first nozzle ejects the workpiece W to the processing point when the workpiece W is processed (t1 to t2, t3 to t4, and the like).

  On the other hand, the second solenoid valve 34 is normally open, and the coolant is jetted from the second nozzle 32, and the coolant flows on the guide table 23 in the first pattern shown in FIG. Then, the third solenoid valve 35 is switched to the open state when the first electric valve is closed (t2 to t3, etc.), and the coolant is also ejected from the third nozzle 33, so that the second pattern shown in FIG. The coolant is caused to flow on the guide table 23 by. Therefore, the opening and closing of the first solenoid valve and the second solenoid valve 34 are alternately performed, so that the flow rate of the coolant jet to the processing point can be secured.

  In the present embodiment, the case where the second solenoid valve 34 is normally opened is described. However, when the work W is exchanged, the flow of the coolant in the first pattern is performed by jetting from the second nozzle 32. Alternatively, the switching may be alternately performed between the case where ejection is performed from the third nozzle 33 and the case where ejection is performed. By changing the range of the flow of the coolant flowing on the guide table 23 in this manner, it is possible to eliminate a portion where chips are more likely to remain. Further, the second nozzle 32 and the third nozzle 33 are arranged at a position near the through-hole 701 of the body cover front part 7. Therefore, when the opening / closing door 38 is opened, the coolant may splash on the guide table 23 due to the force of the jet, and may scatter outside from the through-hole 701. Thus, both the second solenoid valve 34 and the third solenoid valve 35 may be closed by detecting the open state of the door 38.

  Therefore, according to the present embodiment, since the first to third solenoid valves 35 are provided in the first to third nozzles 33 to control the timing of the ejection of the coolant, especially the flow of the coolant on the upper surface of the guide table 23. Can be changed, and the accumulation of chips can be prevented. Further, the conventional problem can be solved by a simple configuration change for controlling the solenoid valve attached to the coolant pipe 28.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to these, A various change is possible in the range which does not deviate from the meaning.
The opening / closing control of the first to third solenoid valves is not limited to the above-described embodiment. For example, the opening / closing of the second nozzle 32 and the third nozzle 33 is switched during processing of a work in which coolant is jetted from the first nozzle. You may do so.

DESCRIPTION OF SYMBOLS 1 ... Machine tool 5 ... Processing module 6 ... Processing room 12 ... Headstock 14 ... Turret device 15 ... Tool table 16 ... X-axis drive device 17 ... Z-axis drive device 19 ... Control device 21 ... Input port 22 ... Storage tank 23 ... Guide table 28 ... Coolant pipe 32 ... Second nozzle 33 ... Third nozzle 34 ... Second solenoid valve 35 ... Third solenoid valve

Claims (5)

A processing device for processing the workpiece held by the spindle chuck with a tool,
A discharge device for discharging chips generated by processing the workpiece,
An input port for guiding falling chips into the discharge device, and a chip input section including a guide table inclined toward the input port,
A plurality of nozzles for injecting coolant to the processing point of the work and the upper side portion of the guide table are provided. The coolant ejected from the plurality of nozzles is collected into a tank, and supplied to the plurality of nozzles by a pump. A coolant device that repeats
A machine tool comprising: a plurality of nozzles each provided with an electromagnetic valve, and a control device that controls opening and closing of each of the electromagnetic valves.   2. The work according to claim 1, wherein the plurality of nozzles are a first nozzle that ejects a coolant to a processing point of a workpiece, and a second nozzle and a third nozzle that eject a coolant on both upper side portions of the guide table. 3. machine.   When the first solenoid valve corresponding to the first nozzle is opened, one of the second solenoid valve corresponding to the second nozzle and the third solenoid valve corresponding to the third nozzle is opened and the other is closed. The machine tool according to claim 2, wherein both the second solenoid valve and the third solenoid valve are opened when the first solenoid valve is closed.   The one of the second solenoid valve and the third solenoid valve, which is opened when the first solenoid valve is opened, is alternately switched when the first solenoid valve is closed. Machine tools. 3. The machine tool according to claim 2, wherein the control device closes the first to third solenoid valves when the workpiece is transferred to and from the spindle chuck. 4.

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