JP2016097449A - Tool and lathe with chip guide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool and a lathe with a chip guide capable of quickly detecting the occurrence of clogging of a guiding path.SOLUTION: A tool with a chip guide is equipped with a blade portion 2b which contacts with work W to perform cutting; and a cutting guide 3 which is attached to the blade portion 2b, and has a guiding path 5 for guiding chips C generated in the cutting. The guiding path 5 has an inlet 6 disposed near a contact part between the blade portion 2b and the work W, and an outlet 7 disposed separately from the contact part. The chip guide 3 has a fluid supply port 15 for letting a fluid flow from an intermediate part of the guiding path 5 toward the outlet 7, and a detection hole 12d for detecting pressure which is connected between the inlet 6 of the guiding path 5 and the fluid supply port 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tool with a chip guide and a lathe.

  A lathe, which is one of machine tools, holds a workpiece to be processed on a main shaft, and performs cutting with a cutting tool such as a cutting tool while rotating the workpiece. In such a lathe, chips are generated when cutting is performed, and there is a risk of entanglement with a cutting tool or a workpiece. Therefore, for example, a tool with a cutting guide is known in which a chip guide that sucks chips generated by cutting, guides to a position away from the cutting portion, and discharges the chips is attached to the cutting tool (for example, Patent Documents). 1).

  Such a tool with a chip guide is provided with a fluid supply port for flowing a fluid from an intermediate portion of the guide path for guiding chips toward the exit side of the guide path. Since the fluid can be forcibly discharged by this fluid, the configuration is such that the chips are not easily clogged in the guide path.

JP 2012-61534 A

  However, in the above configuration, the cut chips may become clogged before reaching the fluid supply port. In such a case, if the occurrence of clogging is not detected quickly, a large amount of chips will be clogged in the guide path, and it will take a lot of work to remove.

  In view of the circumstances as described above, an object of the present invention is to provide a tool with a chip guide and a lathe capable of quickly detecting occurrence of clogging of a guideway.

  A tool with a chip guide according to the present invention includes a cutting tool that performs cutting while contacting a workpiece, and a chip guide having a guide path that is attached to the cutting tool and guides chips generated by the cutting, The guide path has an inlet disposed in the vicinity of the contact portion between the cutting tool and the workpiece, and an outlet disposed away from the contact portion, and the chip guide is directed from the middle portion of the guide path toward the outlet. It has a fluid supply port for flowing a fluid, and a detection hole for pressure detection connected between the inlet of the induction path and the fluid supply port.

  A lathe according to the present invention includes a spindle that holds a workpiece, the tool with the above-described chip guide for machining the workpiece, a fluid supply port connected to the fluid supply port of the tool with the chip guide, and a chip guide. A pressure detection unit that is connected to the detection hole of the tool-equipped tool and detects the pressure of the detection hole, and a determination unit that determines clogging of chips in the guide path based on the detection result of the pressure detection unit.

  Further, the determination unit may determine clogging of chips in the guide path by comparing a detection result of the pressure detection unit with a predetermined threshold value.

  Further, the exit of the guide path of the tool with the chip guide may be opened to the atmosphere, and the predetermined threshold may be a constant value.

  The determination unit may determine the position of clogging of chips based on the magnitude relationship between the detection result and a predetermined threshold value.

  Further, the tool with a chip guide is attached to the tool post, the pressure detection unit has a piping unit connected to the detection hole, and a converter that converts the pressure in the piping unit into an electrical signal and outputs the electrical signal. The converter may be provided at a position away from the tool post.

  According to the tool with a chip guide according to the present invention, a negative pressure is generated between the inlet of the guide path and the fluid supply port by the fluid flowing from the fluid supply port provided in the middle part of the guide path toward the outlet. . In the present invention, since the detection hole for pressure detection provided in the chip guide is connected between the inlet of the guide path and the fluid supply port, this negative pressure can be detected. When clogging occurs between the inlet of the guide path and the fluid supply port, this negative pressure changes. Therefore, occurrence of clogging can be detected by detecting a change in negative pressure. In this way, it is possible to quickly detect the clogging of the taxiway, and to prevent a large amount of chips from clogging the taxiway.

  According to the lathe according to the present invention, the negative pressure between the inlet of the guide path and the fluid supply port is detected by detecting the pressure of the detection hole by the pressure detection unit connected to the detection hole of the tool with the chip guide. Can be detected. Moreover, since the determination part determines the clogging of the chip in a guidance path based on the detection result of a pressure detection part, generation | occurrence | production of the clogging of a guidance path can be detected rapidly.

  In addition, when the determination unit determines the clogging of chips in the guide path by comparing the detection result of the pressure detection unit with a predetermined threshold, the detection accuracy of the occurrence of clogging can be increased.

  In addition, if the exit of the guideway of the tool with chip guide is open to the atmosphere and the predetermined threshold value is a constant value, a strainer for filtering the chip is not required, so if there is no chip clogging, the negative pressure over time There is no fluctuation. Therefore, it is not necessary to change the threshold value with time, and a fixed threshold value may be used. Thereby, the burden at the time of setting a threshold value can be reduced.

  Further, when clogging occurs in the guide path between the entrance of the guide path and the detection hole, since the inflow of air from the entrance decreases, the negative pressure in the detection hole increases. On the other hand, when clogging occurs between the fluid supply port of the guide passage and the detection hole, the air flow in the detection hole is obstructed, so the negative pressure in the detection hole is reduced. Based on this, when the determination unit determines the position of clogging of chips based on the magnitude relationship between the detection result and a predetermined threshold, whether the position of clogging is the inlet side or the outlet side with respect to the detection hole is determined. Can be determined. Thereby, more information about clogging can be acquired.

  Further, the tool with a chip guide is attached to the tool post, and the pressure detection unit has a piping unit connected to the detection hole, and a converter that converts the pressure in the piping unit into an electrical signal and outputs the electrical signal. When the converter is provided at a position away from the tool post, it is not necessary to provide the electrical wiring of the converter on the tool post, so that the complicated wiring process can be avoided.

It is a figure which shows an example of the tool with a chip guide tool which concerns on embodiment. It is sectional drawing which shows an example of the tool with a chip guide tool which concerns on embodiment. The result of detecting the negative pressure in the negative pressure forming region K of the guide path by connecting a pressure sensor (not shown) to the detection hole when supplying fluid to the tool with a chip guide according to the embodiment for a certain period of time. It is a graph which shows. The result of detecting the negative pressure in the negative pressure forming region K of the guide path by connecting a pressure sensor (not shown) to the detection hole when supplying fluid to the tool with a chip guide according to the embodiment for a certain period of time. It is a graph which shows. It is a figure showing an example of a machine tool concerning an embodiment. It is a figure which shows an example of the tool with a chip guide tool which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to this. Further, in the drawings, in order to describe the embodiment, the scale is appropriately changed and expressed by partially enlarging or emphasizing the description.

  Drawing 1 is a figure showing an example of tool 1 with a chip guide, (a) is a perspective view and (b) is a figure showing an internal composition typically. Drawing 2 is a figure showing an example of the section of tool 1 with a chip guide.

  As shown in FIGS. 1 and 2, the tool with a chip guide 1 includes a cutting tool 2, a chip guide 3, and a fluid supply unit 20.

  The cutting tool 2 performs a turning process in contact with the rotating workpiece W. The cutting tool 2 has a shank 2a and a blade portion 2b. The blade portion 2b is attached to the tip of the shank 2a. As the blade portion 2b, a rotary tool such as a drill or an end mill may be used in addition to a cutting tool for cutting the workpiece W.

  The chip guide 3 guides the chips C generated when the workpiece W is cut to a place away from the cutting part. The chip guide 3 has a main body part 4 and a pipe part 8. The main body 4 is formed in a block shape and is attached to the shank 2a. The tube portion 8 is connected to the main body portion 4.

  A guide path 5 is provided from the main body portion 4 to the pipe portion 8. The guide path 5 guides the chips C. The guide path 5 is formed in a hole shape having a circular cross section, but is not limited thereto, and may be formed in a hole shape having a rectangular cross section or a polygonal shape. The inlet 6 of the guide path 5 is disposed in the vicinity of the contact portion between the cutting tool 2 and the workpiece W in the main body 4. The outlet 7 of the guide path 5 is disposed at the end of the pipe portion 8. The end portion of the tube portion 8 is open to the atmosphere and is disposed at a position away from the blade portion 2b.

  The guide path 5 includes a main body side guide path 5a and a tube side guide path 5b. The main body side guide path 5 a is formed from the inlet 6 to the inside of the main body portion 4. The tube side guide path 5 b is formed from the inside of the tube portion 8 to the outlet 7. The main body side guiding path 5 a and the pipe side guiding path 5 b are communicated with each other through a joint portion between the main body section 4 and the pipe section 8.

  The main body 4 is composed of four constituent members (a first member 11, a second member 12, a third member 13, and a fourth member 14) arranged from the inlet 6 side of the guide path 5 toward the pipe portion 8 side. Yes. The first member 11 is formed with an inclined portion 5 c that extends upwardly from the inlet 6 of the guide path 5 toward the second member 12. The inclined portion 5c constitutes a part of the main body side guide path 5a.

  The second member 12 is disposed between the first member 11 and the third member 13. The 2nd member 12 has the recessed part 12b formed in the 1st member 11 side, and is connected with the 1st member 11 through this recessed part 12b. Moreover, the 2nd member 12 has the cylindrical part 12a. The cylindrical portion 12 a is formed so as to protrude from the bottom of the recess 12 b toward the third member 13, and the protruding portion is inserted into the third member 13. The inside of the cylindrical part 12a becomes the chip distribution part 5d through which the chip C can pass. The chip distribution part 5d is formed so as to penetrate from the bottom of the recess 12b to the third member 13 side, and communicates with the inclined part 5c. The chip distribution part 5d constitutes a part of the main body side guide path 5a. A tapered portion 12c is formed at the tip in the protruding direction of the cylindrical portion 12a.

  The second member 12 is formed with a detection hole 12d for pressure detection. The detection hole 12d is used to detect the pressure in the negative pressure forming region K from the inlet 6 to the fluid supply port 15 described later in the guide path 5. For example, the detection hole 12d is formed so as to penetrate the second member 12 from the outer surface of the second member 12 to the inner surface of the cylindrical portion 12a. In FIG. 2, a configuration in which the detection hole 12d is formed in the vertical direction in the upper wall portion of the drawing is shown as an example, but the present invention is not limited to this. This detection hole 12d is connected to the chip distribution part 5d from the outside of the main body part 4. By connecting a pressure sensor (not shown) to the detection hole 12d from the outside, the pressure in the negative pressure forming region K in the guide path 5 can be detected.

  The third member 13 is disposed between the second member 12 and the fourth member 14. The third member 13 is formed in a cylindrical shape. At the end of the third member 13 on the second member 12 side and the end of the fourth member 14 side, flanges 13a and 13b are formed. The flange portions 13a and 13b are formed in an annular shape and project inward in the radial direction. The cylindrical portion 12a of the second member 12 is fitted to the flange portion 13a. Further, a tubular portion 14a of a fourth member 14 described later is fitted to the flange portion 13b. Therefore, the inside 13c of the third member 13 is in a state of being sealed by the second member 12 and the fourth member 14 (the cylindrical portion 12a and the cylindrical portion 14a).

  The third member 13 is formed with a through hole 13d penetrating the inside and the outside. A supply pipe 22 described later is attached to the through hole 13d. The inside of the supply pipe 22 communicates with the inside 13c of the third member 13 through the through hole 13d.

  The fourth member 14 is connected to the third member 13. The 4th member 14 has the cylindrical part 14a and the recessed part 14b. The cylindrical portion 14 a is formed so as to protrude toward the third member 13, and the protruding portion is inserted into the flange portion 13 b of the third member 13.

  The 2nd member 12 and the 4th member 14 are being fixed in the state where taper part 12c of cylindrical part 12a was inserted in the tip part of cylindrical part 14a. The taper portion 12c and the inner peripheral surface 14c are arranged to face each other, and a gap (15) is provided between them. The gap (15) serves as a fluid supply port for supplying fluid to the guide path 5 as will be described later. Hereinafter, the gap (15) is referred to as a fluid supply port 15. The fluid supply port 15 is provided in the middle part of the guide path 5. In addition, the inclination angle of the inner peripheral surface 14c of the cylindrical part 14a is set corresponding to the inclination angle of the taper part 12c.

  The inside of the cylindrical part 14a becomes the chip distribution part 5e through which the chip C can pass. The chip distribution part 5e is formed so as to penetrate from the bottom of the recess 14b to the third member 13 side. The chip circulation part 5e is communicated with the chip circulation part 5d and is communicated with the inside 13c of the third member 13 through the fluid supply port 15 formed between the taper part 12c and the inner peripheral surface 14c. . The chip distribution part 5e constitutes a part of the main body side guide path 5a. An inner peripheral surface 14c is formed so as to spread toward the tip at the tip portion in the protruding direction of the cylindrical portion 14a.

  The fluid supply unit 20 includes a supply source 21 and a supply pipe 22. The fluid supply unit 20 causes the fluid to flow through the guide path 5 in order to forcibly discharge the chips C in the guide path 5. The supply source 21 supplies a fluid such as air. The supply pipe 22 has one end connected to the supply source 21 and the other end connected to the through hole 13 d of the third member 13. The supply pipe 22 distributes the air supplied from the supply source 21 and supplies the air to the inside 13 c of the third member 13.

  Air supplied from the supply source 21 to the inside 13 c of the third member 13 through the supply pipe 22 flows through the fluid supply port 15. At this time, because the fluid supply port 15 is inclined toward the chip circulation portion 5e side of the cylindrical portion 14a due to the inclination of the tapered portion 12c and the inner peripheral surface 14c, the air flowing through the fluid supply port 15 is transferred to the chip distribution portion 5e. When it flows in, it flows toward the pipe portion 8 and is discharged from the outlet 7. Thus, when air flows from the chip distribution part 5e toward the pipe side induction path 5b and the outlet 7 in the guide path 5, negative pressure is generated in the chip distribution part 5d and the inclined part 5c on the upstream side. Due to this negative pressure, a suction force toward the guide path 5 is generated at the inlet 6. With this suction force, the chips C are sucked into the guide path 5 from the inlet 6. The chip C sucked into the guide path 5 passes through the inclined part 5c and the chip distribution part 5d while being extended. Then, the chips C are conveyed along with the fluid (air) through the chip circulation part 5e and the pipe side guide path 5b, and are discharged from the outlet 7.

  Thereby, since the chip C is forcibly discharged using air, the chip C hardly hits the inner wall surface of the guide path 5, and the chip C is hardly caught. Therefore, the chip C can be reliably guided to the outlet 7 side. Moreover, since the flow of air is along the inner wall surface of the guide path 5, the effect | action which extends the chip C is large and the process of the chip C after discharge | emission becomes easy.

  On the other hand, there is a possibility that clogging occurs until the chips C reach the air flow, that is, until the chips C are sucked from the inlet 6 and reach the fluid supply port 15. If the occurrence of such clogging is not detected quickly, a large amount of chips C are clogged in the guide path 5 and the time and effort for removing it will increase.

  On the other hand, in this embodiment, since the detection hole 12d for pressure detection provided in the main body portion 4 of the chip guide 3 is connected to the negative pressure formation region K of the guide path 5, this negative pressure formation region. The negative pressure generated in K can be detected. When no clogging occurs between the inlet 6 of the guide path 5 and the fluid supply port 15, this negative pressure maintains a substantially constant state. In addition, when clogging occurs between the inlet 6 of the guide path 5 and the fluid supply port 15, the negative pressure changes.

  For example, when clogging occurs between the inlet 6 of the guide path 5 and the detection hole 12d, the inflow of air from the inlet 6 decreases, and the negative pressure of the detection hole 12d increases. On the other hand, when clogging occurs between the fluid supply port 15 of the guide path 5 and the detection hole 12d, the air flow in the detection hole 12d is obstructed, so the negative pressure in the detection hole 12d is reduced.

  3 and 4 show a case in which a pressure sensor (not shown) is connected to the detection hole 12d and a negative pressure forming region K of the guide path 5 is connected to the tool 1 with a chip guide for a certain period of time. It is a graph which shows the result of having detected negative pressure. In each graph, the horizontal axis indicates the elapsed time (s) from the start of supply, and the vertical axis indicates the negative pressure (kPa) generated. Further, the value of the negative pressure generated and the elapsed time of the supply start are shown as an example.

  FIG. 3A is a graph showing a detection result when no clogging occurs. As shown in FIG. 3A, the negative pressure in the negative pressure forming region K increases and reaches a peak value for about 1 to 1.5 seconds after the fluid supply is started. And after exceeding a peak value, a negative pressure falls, and after about 4 second passes since a supply start, a negative pressure is stabilized. In addition, after a predetermined time (about 4 seconds) has elapsed after the negative pressure has stabilized, the supply of the fluid is stopped to reduce the negative pressure. After about 10 seconds from the start of the supply, the negative pressure is reduced to 0. It is close to.

  FIG. 3B is a graph showing an example of the detection result. As shown in FIG. 3 (b), it can be read that the value of the negative pressure is lowered from the state where the negative pressure is stabilized after 4 seconds from the start of supply. As described above, when the negative pressure decreases with respect to the graph of FIG. 3A, it can be determined that the guide path 5 is clogged. Further, since the negative pressure is reduced due to the occurrence of clogging, it can be determined that the clogging position is between the fluid supply port 15 of the guide path 5 and the detection hole 12d.

  FIG. 4A is a graph showing an example of the detection result. As shown in FIG. 4A, the peak value of the negative pressure after the start of fluid supply and the value when the negative pressure is stabilized are larger than the graph of FIG. Can be read. Thus, when the negative pressure is increasing with respect to the graph of FIG. 3A, it can be determined that the guide path 5 is clogged. Further, since the negative pressure is increased due to the occurrence of clogging, it can be determined that the clogging position is between the inlet 6 of the guide path 5 and the detection hole 12d.

  FIG. 4B is a graph showing an example of the detection result. As shown in FIG. 4 (b), after the negative pressure has stabilized after about 4 seconds from the start of supply, for example, the negative pressure value once decreases at the time when about 5 seconds have elapsed from the start of supply. It can be seen that when about 6 seconds have elapsed, the value of the negative pressure increases and returns to the stable value. In this way, when the negative pressure decreases (changes) and then returns to a stable value, it can be determined that the clogging of the guide path 5 has temporarily occurred, but the clogging has been eliminated thereafter. In this case, since the negative pressure is reduced due to the occurrence of clogging, it can be determined that the clogging position is between the fluid supply port 15 of the guide path 5 and the detection hole 12d.

  As described above, according to the tool with the chip guide 1 of the present embodiment, a change in the negative pressure in the negative pressure forming region K between the inlet 6 of the guide path 5 and the fluid supply port 15 is detected from the detection hole 12d. Thus, the occurrence of clogging of the guide path 5 can be detected. Thereby, it is possible to quickly detect the clogging of the guide path 5 and prevent the guide path 5 from being clogged with a large amount of chips.

  FIG. 5 shows an example of a main part of a machine tool 100 on which the above-mentioned tool 1 with a chip guide is mounted. A machine tool 100 shown in FIG. 5 is a lathe. In FIG. 5, the + Y side of the machine tool 100 is the front surface, and the −Y side is the back surface. Further, the ± Z side of the machine tool 100 is a side surface, and the Z direction is the left-right direction of the machine tool 100. 5 shows the processing area of the machine tool 100, a chip conveyor (not shown) may be provided at the bottom of the processing area, for example.

  As shown in FIG. 5, the machine tool 100 has a base 31. The base 31 is provided with a headstock 32 and a tailstock (not shown). The head stock 32 supports the main shaft 37 in a rotatable state by a bearing (not shown) or the like. A plurality of grasping claws (not shown) for gripping the workpiece W are provided at the end of the main shaft 37 on the + Z side. Note that one end of the work W is held by a grasping claw, and the other end is supported by a core push stand (not shown).

  An end portion on the −Z side of the main shaft 37 protrudes from the main shaft base 32 in the −Z direction, and a pulley 41 is attached to this end portion. A belt 43 is stretched between the pulley 41 and the rotating shaft of the motor 42 provided on the base 31. As a result, the main shaft 37 rotates via the belt 43 by driving the motor 42. The rotation speed of the motor 42 is controlled by an instruction from a control unit (not shown). For example, a motor having a torque control mechanism is used as the motor 42.

  The base 31 is provided with a Z direction guide 35 disposed in the Z direction. Further, similarly to the Z direction guide 35, a Z direction guide 35 </ b> A disposed in the Z direction is provided at the −X position of the Z direction guide 35. Each of the Z direction guides 35 and 35A is provided with Z-axis slides 47 and 47A that are movable in the Z direction along the Z direction guides 35 and 35A. The Z-axis slides 47 and 47A are moved in the Z direction by a drive system (not shown) and are held at predetermined positions.

  X-direction guides 48 and 48A are formed on the Z-axis slides 47 and 47A, respectively. The Z-axis slides 47 and 47A are provided with X-axis slides 45 and 45A that can move along the X-direction guides 48 and 48A, respectively. The X-axis slides 45 and 45A are moved in the X direction by a drive system (not shown) and are held at predetermined positions.

  Y-direction guides 46 and 46A are formed on the X-axis slides 45 and 45A, respectively. The X-axis slides 45 and 45A are provided with tool post driving units 51 and 51A that can move along the Y-direction guides 46 and 46A, respectively. The tool post driving units 51 and 51Y are moved in the Y direction by a drive system (not shown) and are held at predetermined positions. The Z direction drive system, the X direction drive system, and the Y direction drive system are controlled by the control unit 64A.

  Each of the tool post drive units 51 and 51A accommodates a rotary drive device such as a motor. Turrets (turrets) 53 and 53A are attached to the tool post driving units 51 and 51A. The turrets 53 and 53A are rotatable about the Z direction as driven by a rotary drive device. The turret 53 is disposed above (+ X side) the workpiece W, and the turret 53A is disposed below (−X side).

  On the peripheral surfaces of the turrets 53 and 53 </ b> A, a plurality of holding portions 54 for holding the tool 1 with a chip guide are provided. The above-mentioned tool 1 with a chip guide is held on all or a part of the holding portions 54. Therefore, the tool 1 with a chip guide is selected by rotating the turrets 53 and 53A. The tool with chip guide 1 held by the holding part 54 can be exchanged for each holding part 54.

  The fluid supply unit 20 is connected to the tool 1 with a chip guide. The fluid supply unit 20 allows fluid to flow toward the outlet 7 in the guide path 5 (the chip circulation part 5e and the pipe side guide path 5b). The operation of the fluid supply unit 20 is controlled by the control unit 64A.

  Moreover, the pressure sensor (pressure detection part) 60 is connected to the tool 1 with a chip guide. The pressure sensor 60 includes a main body detection unit 61, a piping unit 62, and a converter 63. The main body detection unit 61 detects the pressure of the piping unit 62. The piping part 62 is connected to the detection hole 12d of the tool 1 with a chip guide. Therefore, in the pressure sensor 60, the main body detection unit 61 detects the pressure in the piping unit 62, so that the negative pressure in the negative pressure formation region K (see FIGS. 1 and 2) of the guide path 5 can be detected. Moreover, the converter 63 converts the pressure in the piping part 62 into an electrical signal and outputs it. The converter 63 is provided at a position away from the turrets 53 and 53A. Thereby, since it is not necessary to provide the electrical wiring of the pressure sensor 60 in the turrets 53 and 53A, the complexity of wiring processing can be avoided. The detection result by the pressure sensor 60 is output from the converter 63 to the control unit 64A. In addition, in the structure which attaches a some tool to the turrets 53 and 53A, and switches a tool according to the objective of cutting, what is called a tool change, a piping part is provided in a turret, and the piping part of the tool 1 with a chip guide used to use A configuration in which 62 and the piping portion in the turret communicate with each other can be employed.

  The control unit 64A includes a determination unit 64 that determines the presence or absence of clogging based on the detection result of the pressure sensor 60. In the determination part 64, the presence or absence of clogging is determined by comparing a predetermined threshold value with the detection result of the pressure sensor 60.

  As the predetermined threshold value, for example, a value when the negative pressure in the negative pressure forming region K is stabilized after the fluid supply unit 20 starts supplying the fluid without clogging can be used. In the present embodiment, since the end portion of the tube portion 8 is opened to the atmosphere, the negative pressure at the time of stabilization becomes a substantially constant value. Therefore, a substantially constant value is used as the predetermined threshold value. As the predetermined threshold value, a peak value or the like after the fluid supply unit 20 starts supplying the fluid without clogging may be used. The determination unit 64 determines that clogging has occurred when the detection result by the pressure sensor 60 is larger or smaller than a predetermined threshold.

  As described above, when the negative pressure is reduced due to the occurrence of clogging, the determination unit 64 determines that the clogging position is between the fluid supply port 15 of the guide path 5 and the detection hole 12d. Can do. When the negative pressure is increased due to the occurrence of clogging, the determination unit 64 can determine that the clogging position is between the inlet 6 of the guide path 5 and the detection hole 12d. As described above, the determination unit 64 can determine the position of clogging based on the magnitude relationship with the predetermined threshold.

  The operation of the machine tool 100 configured as described above will be described. First, the workpiece W to be processed is held on the spindle 37. After gripping the workpiece W, the workpiece W is rotated by rotating the main shaft 37. Subsequently, the turret 53 is rotated to select the tool 1 with a chip guide.

  Then, when the rotation of the workpiece W is stabilized, the fluid supply unit 20 of the tool 1 with the chip guide is operated to flow the fluid through the guide path 5. Thereby, a negative pressure is generated in the negative pressure forming region K. Then, it cuts with respect to the workpiece | work W with the blade part 2b of the tool 1 with a chip guide. At this time, the control unit 64 </ b> A is in a state where the negative pressure in the negative pressure forming region K is detected by the pressure sensor 60. Thereby, the change of the negative pressure of the negative pressure formation area K can be detected.

  Chip C generated by cutting is sucked into the guide path 5 from the inlet 6 of the tool 1 with a chip guide, flows through the main body side guide path 5a and the pipe side guide path 5b, and is disposed at a position away from the cutting portion. It is discharged from the outlet 7. Thereby, it is possible to prevent the chips C from being entangled with the workpiece W or the like. Then, when the cutting of the workpiece W is completed, the holding by the grasping claw 9a is released, and the workpiece W is taken out.

  Thus, according to the machine tool 100 according to the present embodiment, the negative pressure change abnormality (larger than the threshold value) is detected by detecting the negative pressure change in the negative pressure forming region K during the cutting process. Can be quickly detected. Thereby, clogging in the negative pressure forming region K in the guide path 5 can be detected quickly.

The embodiment has been described above, but the present invention is not limited to the above description, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, the configuration in which the detection hole 12d is provided in the second member 12 of the main body 4 is described as an example, but the present invention is not limited to this. FIG. 6 is a diagram illustrating an example of a tool 1A with a chip guide according to a modification. For example, as shown in FIG. 6, a detection hole 11 d may be provided in the first member 11. Even in this case, the negative pressure in the negative pressure forming region K can be detected. A plurality of detection holes may be provided. In this case, a pressure sensor may be provided corresponding to each detection hole.

  K ... Negative pressure forming area W ... Workpiece C ... Chip 64A ... Control part 1, 1A ... Tool with chip guide 2 ... Cutting tool 2b ... Blade part 3 ... Chip guide 4 ... Main body part 5 ... Guideway 5a ... Main body side Guide path 5b ... Pipe side guide path 5c ... Inclined part 5d ... Chip distribution part 5e ... Chip distribution part 6 ... Inlet 7 ... Outlet 8 ... Pipe part 11d, 12d ... Detection hole 15 ... Fluid supply port 20 ... Fluid supply part 37 ... Spindles 53, 53A ... Turret (tool post) 60 ... Pressure sensor 62 ... Piping part 63 ... Transducer 64 ... Determination part 100 ... Machine tool

Claims (6)

A cutting tool that performs cutting by contacting the workpiece;
A chip guide attached to the cutting tool and having a guide path for guiding chips generated by the cutting,
The guide path has an inlet disposed in the vicinity of a contact portion between the cutting tool and the workpiece, and an outlet disposed away from the contact portion,
The chip guide is for detecting a pressure connected between a fluid supply port for flowing a fluid from an intermediate portion of the guide path toward the outlet, and the inlet and the fluid supply port of the guide path. A tool with a chip guide having a detection hole. A spindle that holds the workpiece,
The tool with a chip guide according to claim 1, wherein the workpiece is machined.
A supply source for supplying the fluid connected to the fluid supply port of the tool with the chip guide;
A pressure detection unit connected to the detection hole of the chip guide tool and detecting the pressure of the detection hole;
A lathe, comprising: a determination unit that determines clogging of the chips in the guide path based on a detection result of the pressure detection unit.   The lathe according to claim 2, wherein the determination unit determines the clogging of the chips in the guide path by comparing a detection result of the pressure detection unit with a predetermined threshold value. The exit of the guide path of the tool with the chip guide is opened to the atmosphere,
The lathe according to claim 3, wherein the predetermined threshold value is a constant value.   The lathe according to claim 3 or 4, wherein the determination unit determines the position of the clogging of the chips based on a magnitude relationship between the detection result and the predetermined threshold value. The tool with a chip guide is attached to a tool post,
The pressure detection unit has a pipe part connected to the detection hole, and a converter that converts the pressure in the pipe part into an electrical signal and outputs the electric signal.
The lathe according to any one of claims 2 to 4, wherein the converter is provided at a position away from the tool post.

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