WO2019016899A1 - Dispositif de commande de valeur numérique - Google Patents

Dispositif de commande de valeur numérique Download PDF

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Publication number
WO2019016899A1
WO2019016899A1 PCT/JP2017/026139 JP2017026139W WO2019016899A1 WO 2019016899 A1 WO2019016899 A1 WO 2019016899A1 JP 2017026139 W JP2017026139 W JP 2017026139W WO 2019016899 A1 WO2019016899 A1 WO 2019016899A1
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WO
WIPO (PCT)
Prior art keywords
tool
point
command
unit
retraction
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PCT/JP2017/026139
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English (en)
Japanese (ja)
Inventor
泰一 石田
Original Assignee
三菱電機株式会社
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2017/026139 priority Critical patent/WO2019016899A1/fr
Priority to JP2018518756A priority patent/JPWO2019016899A1/ja
Publication of WO2019016899A1 publication Critical patent/WO2019016899A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G1/00—Thread cutting; Automatic machines specially designed therefor
    • B23G1/02—Thread cutting; Automatic machines specially designed therefor on an external or internal cylindrical or conical surface, e.g. on recesses
    • B23G1/08—Machines with a plurality of working spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/4093—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part programme, for the NC machine

Definitions

  • the present invention relates to a numerical control device for controlling the operation of a threading tool.
  • the threading cycle command is a command for performing roughing and finishing by designating a starting point of threading, an end point of threading, a thread height, a thread lead and a cutting amount.
  • the screw lead is the amount of movement of the tool when the work rotates once. In roughing, cutting is repeated while changing the cutting amount.
  • the present invention has been made in view of the above, and it is an object of the present invention to obtain a numerical control device which shortens the length of chips in a threading cycle and suppresses formation of an incompletely threaded portion. .
  • the present invention is directed to an amount designated in a specified direction from a retraction position where the tool starts retraction.
  • a retraction command creating unit that creates a retraction command that is a command to retract only the A control unit for moving the tool to the retracted position after the tool is moved in the third direction while being moved in a third direction different from the direction in which the tool advances when forming the tool And.
  • the numerical control device can shorten the chip length in the threading cycle and can suppress the formation of the incompletely threaded portion.
  • a diagram showing a configuration of a numerical control device according to an embodiment Diagram for explaining the operation of the tool in the case of performing threading from the starting end to the end of threading in a single threading process on a workpiece
  • the figure for explaining the operation of the tool in the case of forming a screw in a work in roughing of an embodiment The flowchart which shows the procedure of operation of the control part at the time of the control part which the numerical control device concerning an embodiment outputs a command to data creation part for servo amplifiers, and the judgment part which a numerical control device has
  • FIG. 8 shows a processor in a case where at least a part of functions of an analysis unit, a threading feed command creation unit, a retraction command creation unit, a control unit, an approach calculation unit, and a determination unit included in the numerical control apparatus according to the embodiment is realized by a processor.
  • Figure When at least a part of components constituting the analysis unit, threading feed command creation unit, retraction command creation unit, control unit, approach calculation unit, and determination unit included in the numerical control device according to the embodiment is realized by the processing circuit Figure showing the processing circuit of
  • FIG. 1 is a diagram showing a configuration of a numerical control device 1 according to the embodiment.
  • the numerical control device 1 is a device for controlling the operation of a tool 30 that performs threading on the workpiece 20.
  • the workpiece 20 and the tool 30 are also shown in FIG.
  • the numerical control device 1 performs processing for controlling the operation of the tool 30 based on the analysis unit 2 that analyzes a threading cycle command given from the outside of the numerical control device 1 and the analysis result obtained by the analysis unit 2. And a threading cycle processing unit 3 to be performed.
  • the threading cycle processing unit 3 retracts the tool 30 by a designated amount in a specified direction from the retraction position in the threading feed command creating unit 4 that creates a command for moving the tool 30 and roughing the threading cycle.
  • a save command creation unit 5 for creating a save command that is a command for The retracted position is a position at which the tool 30 starts retracting from the workpiece 20.
  • the threading cycle consists of multiple rounds of threading and finishing.
  • the numerical control device 1 further includes a control unit 6 that retracts the tool 30 from the retraction position in accordance with the retraction command created by the retraction command creation unit 5. After the tool 30 retracts from the retraction position according to the retraction command created by the retraction command creation unit 5, the control unit 6 is in a direction different from the direction in which the tool 30 advances when forming the screw. The tool 30 is moved to the retracted position after the tool 30 is moved in the third direction while being moved in a certain third direction.
  • the above-mentioned third direction does not include the direction in which the tool 30 advances when forming a screw, or the diagonal forward direction in which the tool 30 advances when forming a screw.
  • An example of the third orientation is parallel to the direction of the lead axis and opposite to the direction in which the tool 30 travels in forming the screw.
  • the third orientation may not be parallel to the direction of the lead axis.
  • the third orientation may be a diagonally back upward or diagonally back downward orientation in which the tool 30 advances in forming the screw.
  • the upper side is above the vertical direction, and the lower side is below the vertical direction.
  • the threading cycle processing unit 3 retracts the tool 30 after the tool 30 is retracted. It further includes an approach calculation unit 7 that calculates the distance of the approach, which is the amount of movement in the direction of 3. To explain further, the approach calculation unit 7 calculates the distance of the approach for suppressing the formation of the incompletely threaded portion in the roughing.
  • the direction in which the tool 30 advances as it forms a screw is parallel to the direction of the lead axis.
  • the approach calculation unit 7 causes the retraction command creation unit 5 to When the tool 30 moves to the retracted position after the tool 30 moves from the retracted position according to the created retraction command and then moves in the direction opposite to the direction in which the tool 30 advances when forming the screw, the tool 30 Calculates the approach distance, which is the amount by which the tool 30 moves in the opposite direction as described above. To explain further, the approach calculation unit 7 calculates the distance of the approach for suppressing the formation of the incompletely threaded portion in the roughing.
  • the threading cycle processing unit 3 further includes a determination unit 8 that determines whether the tool 30 performing threading is performing roughing processing or finishing processing in the threading cycle. Details of the analysis unit 2, the threading feed command creation unit 4, the retraction command creation unit 5, the control unit 6, the approach calculation unit 7, and the determination unit 8 will be described later. Also shown in FIG. 1 are a spindle amplifier data creation unit 11, a spindle amplifier 12, a spindle motor 13, a servo amplifier data creation unit 14, a servo amplifier 15, and a servo motor 16. Details of the spindle amplifier data creating unit 11, the spindle amplifier 12, the spindle motor 13, the servo amplifier data creating unit 14, the servo amplifier 15, and the servo motor 16 will be described later.
  • FIG. 2 is a view for explaining the operation of the tool 30 in the case where the threading from the starting end to the end of threading is performed on the work 20 in one threading process.
  • each of point (a), point (b), point (c) and point (d) show different points in the path when the tool 30 moves.
  • Point (b) is the point corresponding to the beginning of the threading process.
  • Point (c) is the point corresponding to the end of the threading process.
  • the tool 30 When threading the work 20 from the start to the end of the screw in a single threading process, the tool 30 is able to cut points (a), (b), (c) and (d) The path connecting in order is moved in the order of point (a), point (b), point (c), point (d) and point (a). When moving the path, the tool 30 changes the cutting amount and moves the path again. The tool 30 repeatedly performs the above-mentioned operation to form a screw on the work 20.
  • the tool 30 When moving, if the viscosity of the workpiece 20 is high, relatively long chips are produced. Since relatively long chips may wrap around one or both of the work 20 and the tool 30, one or both of the work 20 and the tool 30 may be lost.
  • the to-be-threaded portion of the work 20 in the lead axis direction is divided into a plurality of sections, and threading is performed in each section, and threading is performed in each section Every time the process is completed, the work is interrupted and the tool 30 is retracted from the work 20.
  • the threaded portion is a partial path connecting the point (b) and the point (c).
  • FIG. 3 is a view for explaining the operation of the tool 30 in the case of forming a screw on the work 20 in the roughing of the embodiment.
  • FIG. 3 divides the threaded portion of the work 20 in the direction of the lead axis into a plurality of sections, performs threading in each section, and performs threading in each section in the rough processing of the embodiment.
  • It is a figure for demonstrating operation
  • Each of (j) shows the mutually different point in the path
  • Points (a), (b), (c) and (d) in FIG. 3 are mechanical with respect to points (a), (b), (c) and (d) in FIG. The position is the same.
  • the tool 30 moves a first partial path connecting the point (a), the point (b) and the point (e) in this order from the point (a) to the point (e).
  • the orientation from point (b) to point (e) is the direction in which the tool 30 proceeds as it forms a screw.
  • the direction in which the tool 30 advances as it forms a screw is parallel to the direction of the lead axis.
  • the tool 30 moves a second partial path connecting the point (e) and the point (f) from the point (e) to the point (f).
  • the direction from point (e) to point (f) is the specified direction.
  • the distance from point (e) to point (f) is a specified amount. That is, the tool 30 retracts from the work 20 by an amount designated in the designated direction from the retraction position (e).
  • the retraction command creation unit 5 is a command for retracting the tool 30 from the work 20 by the designated amount in the designated direction from the point (e) which is the retraction position in roughing of the threading cycle. Create a save command.
  • the tool 30 does not cut the work 20.
  • the tool 30 moves the third partial path connecting point (f) and point (g) from point (f) to point (g).
  • the direction from point (f) to point (g) is opposite to the direction the tool 30 travels in forming the screw.
  • the distance from point (f) to point (g) is the distance of one approach.
  • the approach calculation unit 7 calculates the distance of the approach from the point (f) to the point (g).
  • the tool 30 does not cut the work 20.
  • the retraction command creation unit 5 is in a direction different from the direction in which the tool 30 advances when forming the screw from the point (e) at the retraction position in roughing of the threading cycle
  • a retraction command is generated which is a command for receding linearly from the work 20 by an amount specified to be not parallel to the direction in which the tool 30 advances.
  • the specified quantity is the distance from point (e) to point (g).
  • the control unit 6 moves the tool 30 from the retracted position in accordance with the retraction command created by the retraction command creation unit 5.
  • the first vector is defined as a vector from the retracted position when the tool 30 moves in the designated direction from the retracted position by a designated amount to an intermediate position which is the reached position of the tool 30.
  • An example of the first vector is a vector whose start point is point (e) and whose end point is point (f).
  • the second vector is only the distance of the approach that prevents the tool 30 from forming imperfect threads in roughing in the opposite direction to the direction the tool 30 travels from the intermediate position as it forms the screw. It is assumed that the vector is defined as a vector from an intermediate position when moved to an arrival position of the tool 30.
  • An example of the second vector is a vector whose start point is point (f) and whose end point is point (g).
  • the movement amount of the tool 30 when the tool 30 moves from the retracted position according to the retraction command created by the retraction command creation unit 5 is the first vector
  • the tool 30 moves a fourth partial path connecting point (g), point (e) and point (h) in this order from point (g) to point (h).
  • the tool 30 returns from point (g) to the retracted position (e), and after returning to point (e), the partial path from point (e) to point (h) Cutting the workpiece 20 at a position shown in FIG.
  • the orientation from point (e) to point (h) is the same as the orientation from point (b) to point (e). That is, the direction from point (e) to point (h) is the direction in which the tool 30 advances as it forms a screw.
  • the control unit 6 moves the tool 30 to the retracted position after the tool 30 moves in the third direction.
  • the control unit 6 moves the tool 30 to the retracted position (e) after the tool 30 moves from the point (f) to the point (g).
  • the control unit 6 sets the tool 30 to the point (e) at the retracted position. Move it.
  • the control unit 6 moves the tool 30 from the point (e) to the point (h).
  • the tool 30 moves the fifth partial path connecting the point (h) and the point (i) from the point (h) to the point (i).
  • the direction from point (h) to point (i) is the specified direction.
  • the distance from point (h) to point (i) is a specified amount. That is, the tool 30 retracts from the work 20 by the designated amount in the designated direction from the retraction position (h).
  • the retraction command creation unit 5 is a command for retracting the tool 30 from the work 20 by the designated amount in the designated direction from the point (h) which is the retraction position in roughing of the threading cycle. Create a save command.
  • the tool 30 does not cut the work 20.
  • the tool 30 moves the sixth partial path connecting the point (i) and the point (j) from the point (i) to the point (j).
  • the direction from point (i) to point (j) is opposite to the direction the tool 30 travels in forming the screw.
  • the distance from point (i) to point (j) is the distance of one approach.
  • the approach calculation unit 7 calculates the distance of the approach from the point (i) to the point (j).
  • the tool 30 does not cut the work 20.
  • the tool 30 connects the point (j) from the point (j) to the seventh partial path connecting the points (j), (h) and (c) in this order. Move to c).
  • the tool 30 returns from the point (j) to the retracted position (h), and after returning to the point (h), the partial path from the point (h) to the point (c) Cutting the workpiece 20 at a position shown in FIG.
  • the orientation from point (h) to point (c) is the same as the orientation from point (b) to point (e). That is, the direction from point (h) to point (c) is the direction in which the tool 30 advances as it forms a screw.
  • the tool 30 moves an eighth partial path connecting the point (c), the point (d) and the point (a) in this order from the point (c) to the point (a).
  • the tool 30 retracts from the work 20 at the end point (c).
  • the tool 30 does not cut the work 20.
  • the eight steps from the first step to the eighth step described above are one cycle of roughing in the embodiment. In the threading cycle, the above-described one cycle of roughing is performed a plurality of times while changing the cutting amount.
  • the threaded portion between point (b) and point (c) is divided at two retracted positions, point (e) and point (h). That is, in the example of FIG. 3, the threaded portion in the direction of the lead axis has a first section from point (b) to point (e) and a second section from point (e) to point (h) , Divided into three sections from the point (h) to the third section from the point (c). Therefore, in the embodiment described with reference to FIG. 3, the length of the chips is shorter than in the case described with reference to FIG. 2. That is, the chips are prevented from being wound around one or both of the work 20 and the tool 30, and thus, the loss of one or both of the work 20 and the tool 30 is suppressed.
  • the tool 30 is shown in FIG. 3 as points (a), (b), (c), (d) and (d) Move a) in this order.
  • the tool 30 performs cutting on the work 20 when moving from the point (b) to the point (c).
  • the analysis unit 2 receives and analyzes a rotation command which is a command for rotating the work 20 from the outside of the numerical control device 1.
  • the analysis unit 2 outputs the analysis result to the spindle amplifier data creation unit 11.
  • the spindle amplifier data creation unit 11 creates spindle data, which is data corresponding to the analysis result and can be processed by the spindle amplifier 12, and outputs the spindle data to the spindle amplifier 12.
  • the spindle amplifier 12 receives spindle data from the spindle amplifier data creation unit 11 and rotates the spindle motor 13 at the number of revolutions per unit time corresponding to the analysis result.
  • the spindle motor 13 rotates under the control of the spindle amplifier 12, rotates the spindle of the machine tool, and rotates the workpiece 20 attached to the machine tool.
  • the machine tool is not shown.
  • the analysis unit 2 also analyzes a threading cycle command given from the outside of the numerical control device 1.
  • the threading cycle command is the following programmed command.
  • the following threading cycle command character string "G76" is a preparatory function command for specifying a threading cycle. G76 Xx Zz Kk Dd Ff Lmr Jj;
  • the character “X” in the character string “Xx” of the above-mentioned threading cycle command means the coordinate of the start point of threading
  • the character “x” in the character string “Xx” is the concrete at the coordinate of the start point of threading Means a value.
  • the letter “Z” in the letter string “Zz” of the above-mentioned threading cycle command means the coordinate of the threading end point
  • the letter “z” in the letter string “Zz” is the concrete in the coordinates of the threading end point Means a value.
  • the letter “K” in the string “Kk” of the above threading cycle command means the height of the thread, and the letter “k” in the string “Kk” is the specific height of the thread Means a value.
  • the character “D” in the character string “Dd” of the above-mentioned threading cycle command means the cut amount for each cycle in roughing, and the character “d” in the character string “Dd” is a concrete cut amount of the relevant cut amount Mean value.
  • the letter “F” in the letter string “Ff” of the above-mentioned threading cycle command means the lead of the screw.
  • the lead is the amount of movement of the tool 30 when the work 20 makes one rotation.
  • the character “f” in the character string “Ff” means a specific value of the read.
  • the letter “L” in the letter string “Lmr” of the above-mentioned threading cycle command means that the tool 30 relates to withdrawal from the work 20, and the letter “m” in the letter string “Lmr” is the withdrawal axis number
  • the letter “r” in the letter string “Lmr” means the number of evacuations.
  • the character "J” in the character string "Jj" of the above-mentioned threading cycle command means the movement amount when the tool 30 retracts from the work 20, and the character “j" in the character string “Jj” is the movement It means the specific value of the quantity.
  • the string ";" in the threading cycle command above means the end of the command.
  • the analysis unit 2 analyzes, for example, the threading cycle command starting from the above-mentioned character string "G76". That is, the analysis unit 2 calculates the coordinates of the start point of threading, the coordinates of the end point of threading, the height of the thread, the cut amount for each cycle in roughing, the lead, the retraction axis, the number of retractions, and the tool 30. Identifies the amount of movement at the time of evacuation from the work 20. In the example described with reference to FIG.
  • the retraction axis includes a first axis including a straight portion from point (e) to point (f) and a straight portion including a point from (h) to point (i)
  • the analysis unit 2 identifies this as an axis of two.
  • the analysis unit 2 it is specified by the analysis unit 2 that the number of withdrawals is two and the withdrawal positions are the point (e) and the point (h) from the first and second axes twice. Be done.
  • the analysis unit 2 moves the tool 30 from each of the points (e) and (h) which are two retracted positions from the movement amount when the tool 30 retracts from the work 20 and from the first axis and the second axis.
  • the direction of evacuation and the amount of evacuation are specified.
  • the analysis unit 2 outputs the analysis result to the threading cycle processing unit 3.
  • the retraction command creating unit 5 retracts the tool 30 in roughing of the threading cycle from the retraction position by a designated amount in the designated direction.
  • Create a save command that is a command for In the example of FIG. 3, one of the designated orientations is the orientation from point (e) to point (f), and another one of the designated orientations is from point (h) to point (i) It is the direction.
  • One of the specified quantities is the length from point (e) to point (f) and another one of the specified quantities is the length from point (h) to point (i).
  • the number of evacuations is indicated by "r"
  • the coordinates of the position of point (b) in FIG. 3 are "A”
  • the length from point (b) to point (c) in FIG. 3 is "B”
  • the following equation (1) identifies a first retracted position P 1
  • the following equation ( 3) identify the r-th evacuation position P r .
  • r is an integer of 2 or more.
  • Coordinates A are coordinates on the lead axis.
  • the coordinates of each of the retracted position P 1 , the retracted position P 2, and the retracted position P r are coordinates when the direction from the point (b) to the point (c) in FIG. 2 is positive.
  • the approach calculation unit 7 has a direction different from the direction in which the tool 30 advances when the tool 30 forms a screw after the tool 30 retracts from the retraction position according to the retraction command created by the retraction command creation unit 5
  • the distance of the approach which is the amount by which the tool 30 moves in the third direction after the tool 30 retracts.
  • the approach calculation unit 7 calculates the distance of the approach that suppresses the formation of the incompletely threaded portion in roughing.
  • the tool 30 is driven by the servomotor 16 to move.
  • the approach calculation unit 7 calculates the approach distance based on the ability of the servomotor 16 to accelerate the tool 30 when the tool 30 changes its direction and moves.
  • the approach calculation unit 7 calculates the distance ⁇ of the approach by the following equation (4) .
  • the unit of ⁇ is “mm”
  • V is the threading speed (mm / min)
  • t1 is the time (seconds) until the error of the screw pitch becomes acceptable
  • Ts Is the acceleration / deceleration time constant (seconds) of the tool 30
  • Tp is the position loop time constant (seconds) of the tool 30.
  • the threading feed command creation unit 4 moves the tool 30 in the direction in which the tool 30 advances when forming a screw on the lead shaft.
  • feed command for lead shaft a feed command for moving the tool 30 in a direction in which the tool 30 forms a screw on the lead shaft.
  • the data from the spindle amplifier 12 is data indicating the number of revolutions per unit time of the spindle motor 13.
  • the data from the spindle amplifier 12 is data indicating the number of revolutions per minute of the spindle motor 13.
  • the threading feed command creation unit 4 uses the tool 30. After retracting according to the retracting command, a command to move the tool 30 by the calculated approach distance is generated in the third direction.
  • a command for moving the tool 30 by the calculated approach distance in the above-described third direction after the tool 30 is retracted according to the retraction command will be referred to as “a command for movement of the approach distance”.
  • the threading feed command generation unit 4 uses the data from the spindle amplifier 12 to generate a command to move the tool 30 to the retracted position after the tool 30 has moved in the third direction by the approach distance.
  • a command for moving the tool 30 to the retracted position after the tool 30 has moved in the above-described third direction by the approach distance will be referred to as “feed command for return”.
  • control unit 6 returns the lead axis feed command, the retraction command, and the approach distance movement command, and returns One or two of the feed commands for the above are output to the servo amplifier data creation unit 14.
  • the servo amplifier data creation unit 14 creates servo data that is data corresponding to a command from the control unit 6 and that can be processed by the servo amplifier 15, and outputs the servo data to the servo amplifier 15.
  • the servo amplifier 15 receives servo data from the servo amplifier data creation unit 14 and rotates the servomotor 16 at a rotation speed per unit time corresponding to a command from the control unit 6.
  • the servomotor 16 is rotated by the control of the servo amplifier 15 and moves the tool 30 as instructed by the control unit 6.
  • the tool 30 moves, for example, as described using FIG.
  • the control unit 6 outputs a lead axis feed command to the servo amplifier data creation unit 14.
  • the evacuation command creation unit 5 creates a evacuation instruction, and the control unit 6 outputs the evacuation instruction to the servo amplifier data creation unit 14.
  • the approach calculation unit 7 calculates the approach distance, and the control unit 6 outputs a command for moving the approach distance to the servo amplifier data creation unit 14.
  • the control unit 6 outputs, to the servo amplifier data creation unit 14, a feed command for return and a feed command for the lead axis after the tool 30 has moved to the retracted position (e). Do.
  • the evacuation command creation unit 5 creates a evacuation instruction
  • the control unit 6 outputs the evacuation instruction to the servo amplifier data creation unit 14.
  • the approach calculation unit 7 calculates the approach distance
  • the control unit 6 outputs a command for moving the approach distance to the servo amplifier data creation unit 14.
  • the control unit 6 outputs, to the servo amplifier data creating unit 14, a feed command for return and a feed command for the lead axis after the tool 30 has moved to the retracted position (h). Do.
  • control unit 6 moves the tool 30 from the point (c) to the point (a) in an eighth partial path connecting the points (c), (d) and (a) in this order.
  • a feed command is created, and the feed command is output to the servo amplifier data creation unit 14.
  • the threading feed command creation unit 4 creates a command not to retract the tool 30. That is, in the finishing process, the threading feed command creation unit 4 creates a feed command for moving the tool 30 in order of point (a), point (b), point (c), point (d) and point (a)
  • the controller 6 outputs the feed command to the servo amplifier data creation unit 14.
  • FIG. 4 shows the operations of the control unit 6 when the control unit 6 of the numerical control device 1 according to the embodiment outputs a command to the servo amplifier data creation unit 14 and the judgment unit 8 of the numerical control device 1. It is a flowchart which shows a procedure.
  • the determination unit 8 of the threading cycle processing unit 3 determines whether the current processing in the threading cycle is rough processing (S11). For example, the determination unit 8 determines whether the current processing is rough processing based on the current amount of cutting (S11). If it is determined by the determination unit 8 that the current processing is not rough processing (No in S11), the control unit 6 outputs a lead axis feed command to the servo amplifier data creation unit 14 (S12).
  • the determination unit 8 determines whether the tool 30 has reached the retracted position (S13). In step S13, for example, when the numerical control device 1 is provided with a flag that is turned on when the tool 30 passes the retracted position and turned off when the tool 30 has not reached the retracted position, the determination unit 8 Based on the flag, it is determined whether the tool 30 has reached the retracted position. If the determination unit 8 determines that the tool 30 has not reached the retracted position (No in S13), the control unit 6 outputs a lead axis feed command to the servo amplifier data creation unit 14 (S12).
  • the control unit 6 If the determination unit 8 determines that the tool 30 has reached the retracted position (Yes in S13), the control unit 6 outputs a retraction command to the servo amplifier data creation unit 14. After the control unit 6 outputs the retraction command, the determination unit 8 determines whether the tool 30 is retracted (S14). If the determination unit 8 determines that the tool 30 is not retracted (No in S14), the control unit 6 outputs a retraction command to the servo amplifier data creation unit 14 (S15).
  • the determination unit 8 determines whether or not the tool 30 has moved the approach distance calculated by the approach calculation unit 7 It is determined (S16).
  • the control unit 6 instructs the command for moving the approach distance to the servo amplifier data creation unit 14 Output (S17).
  • the control unit 6 sends a feed command for return and after the tool 30 has moved to the retracted position
  • the feed command of the lead axis of is output to the servo amplifier data creation unit 14 (S18).
  • the lead axis feed command after the tool 30 has moved to the retracted position is described as “feed axis lead command after return”.
  • the position at which the tool 30 retracts from the workpiece 20 and the position at which the tool 30 retracts from the workpiece 20 and returns to the lead shaft must match.
  • the position of the thread groove before retraction and the position of the thread groove after return must match.
  • condition 1, condition 2 and condition 3 are necessary for the operation of the tool 30 from retraction to return.
  • Condition 1 is a condition for an operation of retracting the tool 30 according to the retraction command created by the retraction command creation unit 5.
  • FIG. 5 is a diagram for describing an operation of retracting the tool 30 in accordance with the retraction command created by the retraction command creating unit 5 of the numerical control device 1 according to the embodiment.
  • the upper part of FIG. 5 indicates the direction in which the tool 30 advances as it forms a screw on the work 20 with an arrow.
  • the workpiece 20 is also shown at the top of FIG.
  • the workpiece 20 is shown in a screw-formed state.
  • the lower part of FIG. 5 shows a situation where a specific portion of the outer periphery of the spindle of the machine tool to which the workpiece 20 is attached changes with the passage of time. Since the spindle is controlled by the spindle motor 13 to rotate, the position of the specific part is expressed by an angle between 0 and 360 degrees. 360 degrees is the same position as 0 degrees. As is apparent when comparing the upper part and the lower part of FIG. 5 focusing on, for example, two broken lines in FIG. 5, the tool 30 is formed so that a screw groove is formed when the above-mentioned specific part is located at 0 degree. Advance lead axis.
  • the tool 30 retracts from the work 20 in a certain thread groove, and after retracting, returns to the certain thread groove to form a screw.
  • the retracted position specified by the calculation based on the threading cycle command is the point C1 and the point C2. Both points C1 and C2 are located in front of the thread groove in the direction in which the tool 30 advances when forming the thread.
  • the threading feed command creation unit 4 moves the point R1 which is the position of the thread groove which is reached immediately after the point C1 specified by the calculation. It decides with the 1st evacuation position and creates evacuation command. Similarly, the threading feed command creation unit 4 creates a retraction command by determining the point R2 which is the position of the thread groove at which the tool 30 arrives immediately after the point C2 identified by the calculation as the second retraction position. The control unit 6 outputs the retraction command created by the threading feed command creation unit 4 to the servo amplifier data creation unit 14. In FIG. 5, the point R1 and the point R2 are described as the actual retracted position.
  • condition 1 is that the position of the screw groove which arrives immediately after the point specified by the calculation is taken as the retracted position when the tool 30 advances in the direction in which it is formed when forming the screw. is there.
  • Condition 2 is to set the distance ⁇ of the approach calculated by the above equation (4) to an integral multiple of the lead. For example, when the distance ⁇ of the approach is 5.3 mm and the lead is 3 mm, the approach calculation unit 7 calculates 6 mm which is twice 3 mm as the distance of the approach. As described above, when the approach calculation unit 7 rounds the approach distance ⁇ so as to be an integral multiple of the lead, the approach calculation unit 7 calculates the approach distance by making the value after rounding larger than the value before rounding.
  • Condition 3 is such that the position at which the tool 30 returns is the position at which the above specific part is at 0 degrees. That is, when the tool 30 retracts from the work 20 and returns to the threading process, the tool 30 returns to the position of the screw groove at the position when retracted from the work 20.
  • the approach calculation unit 7 calculates the approach distance which is the amount by which the tool 30 moves in the third direction after the tool 30 retracts. Furthermore, the approach calculation unit 7 calculates the distance of the approach that suppresses the formation of the incompletely threaded portion in roughing.
  • the approach calculation unit 7 forms an incomplete thread in roughing. Calculate the distance of the approach to suppress. Alternatively, the approach calculation unit 7 calculates the distance ⁇ of the approach according to the above equation (4).
  • the numerical control device 1 calculates the distance of the approach that suppresses the formation of the incomplete thread portion, and therefore shortens the chip length in the threading cycle and suppresses the formation of the incomplete thread portion can do.
  • the length of the chips can be shortened, and the chips may be one of the work 20 and the tool 30 or Wrapping on both sides is suppressed. That is, by dividing the threaded portion of the work 20 in the lead axis direction into a plurality of sections, it is possible to suppress the loss of one or both of the work 20 and the tool 30. Therefore, in roughing of the threading cycle, it is preferable to divide the threaded portion of the work 20 into a plurality of sections.
  • the tool 30 retracts from each of the plurality of retraction positions in roughing of the threading cycle.
  • the direction in which the tool 30 advances at the retracted position must be parallel to the lead axis direction in order to form a screw on the work 20. Therefore, after retracting from the retracted position, the tool 30 moves in a third direction that is different from the direction in which the tool 30 advances when forming the screw.
  • the servomotor 16 changes the direction in which the tool 30 advances to move the tool 30.
  • the incomplete screw portion is formed in roughing based on the ability of the servomotor 16 to accelerate the tool 30 when the tool 30 changes its direction and moves. Calculate the distance of the approach to suppress.
  • the numerical control device 1 calculates the approach distance according to the above equation (4). That is, the numerical control device 1 calculates the distance of the approach that suppresses the formation of the incompletely threaded portion in roughing. Therefore, the numerical control device 1 can shorten the chip length in the threading cycle and can suppress the formation of the incompletely threaded portion.
  • the threading feed command creation unit 4 creates a command not to retract the tool 30. Therefore, the numerical control device 1 can form a screw with relatively high accuracy.
  • the processor 61 is a central processing unit (CPU), a processing device, an arithmetic device, a microprocessor, a microcomputer, or a digital signal processor (DSP).
  • a memory 62 is also shown in FIG.
  • the processor 61 When at least a part of the functions of the analysis unit 2, the threading feed command creation unit 4, the evacuation command creation unit 5, the control unit 6, the approach calculation unit 7 and the determination unit 8 is realized by the processor 61, the part of the functions is , A processor 61 and software, firmware, or a combination of software and firmware.
  • the software or firmware is written as a program and stored in the memory 62.
  • the processor 61 reads out and executes the program stored in the memory 62 to execute at least the analysis unit 2, the threading feed command creation unit 4, the retraction command creation unit 5, the control unit 6, the approach calculation unit 7, and the determination unit 8. Implement some functions.
  • the numerical control device 1 Is a program that results in execution of steps executed by the analysis unit 2, threading feed command creation unit 4, retraction command creation unit 5, control unit 6, approach calculation unit 7, and part of determination unit 8.
  • Memory 62 for storing the The program stored in the memory 62 includes, as a computer, a procedure or method executed by a part of the analysis unit 2, threading feed command creation unit 4, retraction command creation unit 5, control unit 6, approach calculation unit 7 and determination unit 8. It can be said that it is something to be executed.
  • the memory 62 is, for example, non-volatile, such as random access memory (RAM), read only memory (ROM), flash memory, erasable programmable read only memory (EPROM), EEPROM (registered trademark) (electrically erasable programmable read only memory), etc.
  • RAM random access memory
  • ROM read only memory
  • EPROM erasable programmable read only memory
  • EEPROM registered trademark
  • it is volatile semiconductor memory, magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD (Digital Versatile Disk), or the like.
  • FIG. 7 shows at least a part of the analysis unit 2, the threading feed command creation unit 4, the retraction command creation unit 5, the control unit 6, the approach calculation unit 7, and the determination unit 8 included in the numerical control device 1 according to the embodiment.
  • the processing circuit 71 is dedicated hardware.
  • the processing circuit 71 may be, for example, a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a combination thereof. It is.
  • the analysis unit 2, the threading feed command generation unit 4, the evacuation command generation unit 5, the control unit 6, the approach calculation unit 7, and a part of the determination unit 8 may be dedicated hardware separate from the remaining part.
  • threading feed command creation unit 4 retraction command creation unit 5, control unit 6, approach calculation unit 7, and determination unit 8
  • a part of the plurality of functions is realized by software or firmware
  • the rest of the plurality of functions may be realized by dedicated hardware.
  • the plurality of functions of the analysis unit 2, threading feed command creation unit 4, retraction command creation unit 5, control unit 6, approach calculation unit 7, and determination unit 8 are hardware, software, firmware, or a combination of these. Can be realized by
  • the functions of at least a part of the spindle amplifier data creating unit 11, the spindle amplifier 12, the servo amplifier data creating unit 14 and the servo amplifier 15 shown in FIG. 1 are realized by a processor having the same function as the processor 61 described above It is also good.
  • the spindle amplifier data creating unit 11, the spindle amplifier 12, the servo amplifier data creating unit 14, and the servo amplifier 15 is realized by a processor, the spindle amplifier data creating unit 11, the spindle amplifier 12, the servo A memory is used to store a program that results in the steps executed by at least a part of the amplifier data creation unit 14 and the servo amplifier 15 being executed.
  • the memory is a memory having the same function as the memory 62 described above.
  • the functions of at least a part of the spindle amplifier data creating unit 11, the spindle amplifier 12, the servo amplifier data creating unit 14, and the servo amplifier 15 may be realized by a processing circuit having the same function as the processing circuit 71 described above.
  • the configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. It is also possible to omit or change parts.

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  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
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  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Numerical Control (AREA)
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Abstract

L'invention concerne un dispositif de commande de valeur numérique (1) comprenant : une unité de création d'instruction de retrait (5) qui crée une instruction de retrait servant, au cours du traitement grossier d'un cycle de filetage, à amener un outil (30) à se retirer d'une quantité spécifiée dans une direction désignée, à partir d'une position de retrait au niveau de laquelle l'outil (30) commence à se retirer ; et une unité de commande (6) qui, après que l'outil (30) s'est retiré de la position de retrait conformément à l'instruction de retrait créée par l'unité de création d'instruction de retrait (5), déplace l'outil (30) dans une troisième direction qui est différente de la direction dans laquelle l'outil (30) se déplace lors de la mise en forme d'un filet, et qui déplace l'outil (30) vers la position de retrait après avoir déplacé l'outil (30) dans la troisième direction.
PCT/JP2017/026139 2017-07-19 2017-07-19 Dispositif de commande de valeur numérique WO2019016899A1 (fr)

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PCT/JP2017/026139 WO2019016899A1 (fr) 2017-07-19 2017-07-19 Dispositif de commande de valeur numérique
JP2018518756A JPWO2019016899A1 (ja) 2017-07-19 2017-07-19 数値制御装置

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0788743A (ja) * 1992-05-28 1995-04-04 Yamazaki Mazak Corp Ｎｃ旋盤におけるネジ切り加工方法
JPH10124127A (ja) * 1996-10-16 1998-05-15 Mori Seiki Co Ltd Ｎｃ旋盤を用いたねじ切り装置及びその方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0788743A (ja) * 1992-05-28 1995-04-04 Yamazaki Mazak Corp Ｎｃ旋盤におけるネジ切り加工方法
JPH10124127A (ja) * 1996-10-16 1998-05-15 Mori Seiki Co Ltd Ｎｃ旋盤を用いたねじ切り装置及びその方法

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