JP2007222955A - Automatic spiral flute polishing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic spiral flute polishing device, automatically polishing a spiral flute of a drill. <P>SOLUTION: A rotary driving device 24 and an axial moving device 40 are controlled in association with each other, whereby injection nozzles 32a, 32b are relatively moved along the spiral flutes 14a of the drill 12, and abrasives are sprayed to the surfaces of the spiral flues 14a, 14b extending over the full length to perform polishing treatment. Thus, as compared with the case of worker's manual polishing, only the surfaces of the spiral flutes 14a, 14b are efficiently polished to stably obtain a fixed polishing quality. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a torsion groove automatic polishing apparatus for automatically polishing a surface of a torsion groove provided on an outer peripheral surface of a workpiece.

A rotary cutting tool having a torsion groove on its outer peripheral surface, such as a drill, a tap or an end mill, is known. And when grind | polishing the surface of such a torsion groove | channel, it is common to grind | polish by operating a gun | manual by the operator manually using the grinding | polishing apparatus as described in patent document 1, for example. . The grinding of the twisted grooves is performed for various purposes such as not only improving the surface roughness but also work hardening of the surface, increasing fatigue strength, and roughening.
Japanese Utility Model Publication No. 2-104959

  However, when the operator manually polishes in this way, there is a problem that it is difficult to efficiently polish only the surface of the twisted groove that needs to be polished, and the polishing quality tends to vary.

  The present invention has been made against the background described above, and an object of the present invention is to provide an automatic torsion groove polishing apparatus that automatically polishes torsion grooves such as drills.

  In order to achieve such an object, the first invention is a torsion groove automatic polishing apparatus that automatically polishes the surface of a torsion groove by spraying abrasive onto the torsion groove provided on the outer peripheral surface of the workpiece. (A) an injection nozzle that blows the abrasive toward the workpiece; (b) a rotational drive device that relatively rotates the workpiece and the injection nozzle around an axis of the workpiece; and (c) the workpiece. An axial movement device that relatively moves the jet nozzle in the axial direction of the workpiece; and (d) the jet nozzle is relatively rotated about the axis along the twist groove and is relatively moved in the axial direction. And a synchronous control means for controlling the rotational drive device and the axial movement device in association with each other.

  The second invention is the automatic twist groove polishing apparatus according to the first invention, wherein (a) a groove sensor that detects the twist groove of the workpiece, and (b) the twist sensor is based on the detection result of the groove sensor. Initial position adjusting means for adjusting the initial position of the injection nozzle around the axis of the workpiece by the rotary drive device so that the injection nozzles coincide with each other.

  A third aspect of the invention is the automatic polishing apparatus for twisted grooves according to the second aspect of the invention, wherein (a) the groove sensor is disposed so as to be relatively movable in the axial direction of the workpiece, and (b) the groove sensor is moved to the workpiece. (C) the synchronization control unit is configured to detect the lead of the torsion groove by relative movement in the axial direction of the nozzle, and (c) the synchronization control unit is configured to perform the injection based on the lead detected by the lead detection unit. The rotational driving device and the axial movement device are associated with each other and controlled so that the nozzle is relatively rotated about the axis along the twisted groove and is relatively moved in the axial direction.

  According to a fourth aspect of the present invention, in the automatic twist polishing apparatus according to any one of the first to third aspects, a plurality of the injection nozzles are disposed around the axis of the workpiece, and the plurality of twist grooves of the workpiece are provided. On the other hand, the polishing process can be performed simultaneously.

  According to such a torsion groove automatic polishing device, the synchronous drive means controls the rotation drive device and the axial movement device in association with each other, so that the injection nozzle rotates relative to the axis around the torsion groove of the workpiece. The surface of the torsion groove is automatically polished over the entire length by the abrasive that is moved in the axial direction and is relatively moved in the axial direction. As a result, as compared with the case where the operator manually polishes, only the surface of the torsion groove is efficiently polished, and a constant polishing quality can be stably obtained.

  In the second invention, the initial position of the injection nozzle around the axis of the workpiece is automatically adjusted so that the injection nozzle coincides with the torsion groove by detecting the torsion groove by the groove sensor. Even when the phase around the axis of the workpiece supplied for the purpose is different, the torsion groove can be satisfactorily polished so that the workpiece supply operation becomes easier and the polishing process including the supply operation is performed. Can be fully automated.

  In the third invention, the lead of the torsion groove is automatically detected by relatively moving the groove sensor in the axial direction of the workpiece, and the rotation driving device and the axial direction moving device are synchronously controlled based on the lead. Even when handling a plurality of types of workpieces having different torsion grooves, the torsion grooves of those workpieces can be automatically polished.

  In the fourth invention, since a plurality of injection nozzles are provided and a plurality of twist grooves of the work can be simultaneously polished, the polishing efficiency is improved.

  The torsion groove automatic polishing apparatus of the present invention is suitably used for polishing a torsion groove of a rotary cutting tool such as a drill, a tap, or an end mill, but can also be applied to an apparatus for polishing other workpieces having torsion grooves. The workpiece to be polished is made of a metal material such as cemented carbide or high-speed tool steel, but may be made of other materials. The surface may be coated with a hard coating such as TiAlN, TiCN, TiCrN, TiN, diamond, DLC (diamond-like carbon), or the like.

  As the abrasive, for example, diamond abrasive grains, CBN abrasive grains, steel shots, alumina, and other materials and sizes used in shot blasting can be used. It is appropriately selected according to the purpose of polishing. Such an abrasive is sprayed from the spray nozzle by, for example, pressure air of about 0.1 to 1 MPa and sprayed onto the surface of the twist groove. If necessary, a predetermined liquid can be mixed with an abrasive and sprayed.

  The rotation driving device may be a device that rotates (spins) the workpiece around the axis or a device that rotates (revolves) the injection nozzle around the axis of the workpiece. For example, when the work is centered and fixed concentrically with the rotary table by a chuck or the like, the rotary drive device is configured to rotationally drive the rotary table around the center line. For example, the axial movement device is configured to linearly move the injection nozzle in the axial direction of the workpiece, but may be a device that linearly moves the workpiece in the axial direction. It is also possible to move the spray nozzle in the axial direction of the workpiece by swinging along the arc.

  In the second invention, the phase around the axis of the workpiece supplied automatically or manually is not particularly limited, but the position around the axis is defined so that the direction of the torsion groove is constant, a rotary table or the like The groove sensor and the initial position adjusting means of the second invention are not necessarily required. As the groove sensor of the second invention, for example, a non-contact type distance sensor such as an optical type or an eddy current type is preferably used, and is twisted from a change in distance to the workpiece by being relatively rotated around the workpiece axis. The position of the groove can be detected.

  In the third aspect of the invention, the lead detecting means for detecting the lead of the twisted groove can obtain the lead by detecting the distance in the axial direction of the twisted groove and doubling it when there are two twisted grooves, for example. When there are three twisted grooves, the axial distance between the twisted grooves may be detected and multiplied by three. If the lead is constant, it is not necessary to detect the lead one by one, and even if the lead of the workpiece is different, if the information about the lead is input automatically for each workpiece or manually, the lead detection means is not necessarily unnecessary.

  In the fourth aspect of the invention, two injection nozzles may be provided when there are two twist grooves, and three injection nozzles may be provided when there are three twist grooves. If there are four or more twisted grooves, the number of spray nozzles may be provided as many as the number of twisted grooves. However, if the number is four or six, for example, two nozzles are used to polish two by two. You may do it. In carrying out other inventions, only one injection nozzle may be used, and a plurality of twisted grooves may be polished one by one.

  The injection nozzle may be provided in a fixed posture with respect to the workpiece, but a uniaxial or biaxial injection angle adjusting device may be provided so that the injection angle can be adjusted according to the twist angle of the twist groove. desirable. In addition, an approaching / separating device for approaching and separating the spray nozzle from the work can be provided in accordance with the diameter of the work.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram for explaining the configuration of a torsion groove automatic polishing apparatus 10 according to an embodiment of the present invention. The torsion groove automatic polishing apparatus 10 is for chip discharge provided on an outer peripheral surface of a drill 12 as a workpiece. The two twisted grooves 14a and 14b are polished. In the drill 12, a disk-shaped holder 16 is integrally fixed to the shank portion in advance, and the drill 12 is supplied from the previous process together with the holder 16. Further, the twist grooves 14a and 14b are provided symmetrically with respect to the axis S, and in this embodiment, a hard film such as TiAlN is coated on the surface in advance, and diamond grinding is performed on the hard film. Polishing is performed by spraying abrasives such as grains.

  The torsion groove automatic polishing apparatus 10 includes a rotary table 20 in a substantially hermetically sealed polishing chamber, and the drill 12 is centered on the rotary table 20 by a chuck 22 in a posture in which the axis S is substantially vertical and the tip is upward. And is fixed to the rotary table 20 integrally. The chuck 22 is automatically opened and closed by an electric motor or the like. The rotary table 20 is rotationally driven around a center line at a predetermined rotational speed by a rotary drive device 24 having an electric motor, a speed reducer, and the like, and the drill 12 is also integrated with the rotary table 20. It is rotated (rotated) around the axis S. The drill 12 is automatically carried into the polishing chamber by a loader / unloader device (not shown) in a substantially vertical posture with the tip facing upward, and is automatically carried out of the polishing chamber after polishing. Therefore, the phase around the axis S at the time of loading is inconsistent.

  A vertical moving table 30 is disposed above the rotary table 20, and a pair of injection nozzles 32 a and 32 b are attached at two symmetrical positions with the drill 12 interposed therebetween. An abrasive supply device 34 is connected to the injection nozzles 32a and 32b, and the abrasive is jetted with a predetermined pressure of air. These injection nozzles 32a and 32b are disposed on the vertical movement table 30 via two-axis injection angle adjusting devices 36a and 36b, respectively, and an x axis perpendicular to the paper surface of FIG. By swinging around the y-axis perpendicular to the axis S at right angles to the axis S, the abrasive can be sprayed at a predetermined angle to the torsion grooves 14a, 14b of the drill 12 to perform the polishing process. The vertical moving table 30 is also provided with an approaching / separating device for moving the nozzles 32a, 32b toward and away from the drill 12 together with the spray angle adjusting devices 36a, 36b according to the diameter size of the drill 12, as necessary.

  A groove sensor 38 including a non-contact distance sensor such as an optical type or an eddy current type is disposed on the vertical movement table 30, and the torsion grooves 14 a and 14 b are detected by detecting the distance to the drill 12. The presence or absence of can be detected. Further, the vertical moving table 30 is parallel to the vertical direction, that is, the axis S of the drill 12 fixed to the rotary table 20 by an axial moving device 40 having a feed screw that is rotationally driven in both forward and reverse directions by an electric motor, for example. It can be moved straight in the direction.

  The torsion groove automatic polishing apparatus 10 includes an electronic control unit 42 that includes a microcomputer or the like, and performs a polishing process according to the steps shown in FIG. FIG. 2 shows that when a new drill 12 is carried on the rotary table 20 by a loader / unloader device (not shown), the execution starts. In step S1, the drill 12 is centered concentrically with the rotary table 20 by the chuck 22. Then, it is fixed to the rotary table 20 integrally.

  In step S2, by detecting the distance to the drill 12 by the groove sensor 38 and rotating the drill 12 once by the rotation driving device 24, the position of the torsion grooves 14a and 14b from the change in the distance to the drill 12, that is, the drill The phase around the 12 axis centers S is detected. In addition, by detecting the distance to the drill 12 by the groove sensor 38 and moving the vertical moving table 30 up and down by the axial movement device 40, the two twisted grooves 14a and 14b are detected from the change in the distance to the drill 12. , That is, L / 2, which is half of the lead L of each of the torsion grooves 14a and 14b. The lead L can be obtained by doubling the axial distance L / 2. Of the series of signal processing executed by the electronic control unit 42, the portion that detects the lead L in step S2 corresponds to the lead detection means. In addition, when the information regarding the lead L is automatically input from a computer or the like according to the type of the drill 12 to be polished or manually input by an operator, it is not necessary to detect the lead L one by one.

  In step S3, the injection angles of the injection nozzles 32a and 32b are adjusted by the injection angle adjusting devices 36a and 36b. As long as the twist angles of the twist grooves 14a and 14b are substantially constant regardless of the type of the drill 12, the injection nozzles 32a and 32b may be controlled to a predetermined constant posture. If the torsion angle changes greatly due to the above, the torsion angle is calculated from the diameter of the drill 12 that can be detected by the groove sensor 38 and the lead L, and the injection angle of the injection nozzles 32a and 32b is adjusted according to the torsion angle. To do. When information on a twist angle is automatically input from a computer or the like according to the type of drill 12 to be polished or manually input by an operator, it is not necessary to calculate the twist angle one by one.

  In step S4, the rotary drive device 24 rotates the drill 12 about the axis S, and the axial movement device 40 moves the vertical movement table 30 up and down to move the twist grooves 14a and 14b in the longitudinal direction of the drill 12 in the longitudinal direction. The initial positions of the injection nozzles 32a and 32b and the drill 12 are adjusted so that the twist grooves 14a and 14b and the injection nozzles 32a and 32b coincide with each other at one end, that is, the shank side or the tip side. That is, the spray nozzles 32a and 32b are moved to the axial ends of the twisted grooves 14a and 14b by the axial movement device 40, and based on the groove positions of the twisted grooves 14a and 14b of the drill 12 detected in step S2. Thus, the rotation initial position of the drill 12 is adjusted by the rotation drive device 24 so that the twist grooves 14a and 14b are located on the left and right in FIG. 1 and face the injection nozzles 32a and 32b. Of the series of signal processing executed by the electronic control unit 42, the part for executing step S4 corresponds to the initial position adjusting means.

  In step S5, while the abrasive material is injected from the injection nozzles 32a and 32b by the abrasive material supply device 34, the injection nozzles 32a and 32b are relatively rotated around the axis S along the twisted grooves 14a and 14b and are axially moved. By controlling the rotational drive device 24 and the axial movement device 40 in association with each other so that they can be moved relative to each other, the surface of the torsion grooves 14a and 14b is sprayed on the surface thereof for polishing. Specifically, while the drill 12 is rotated once around the axis S by the rotation drive device 24, the injection nozzles 32a and 32b are moved up and down by the lead L by the axial movement device 40. Of the series of signal processing executed by the electronic control unit 42, the part for executing step S5 corresponds to the synchronization control means.

  In step S5, the twisted grooves 14a and 14b may be polished only once, but may be polished repeatedly a plurality of times. When the polishing process is completed, the chuck 22 is opened and the drill 12 is released in step S6. Thereafter, the drill 12 is automatically taken out of the polishing chamber together with the holder 16 by a loader / unloader device (not shown), and transferred to a subsequent process by a conveyor or the like.

  As described above, according to the torsion groove automatic polishing apparatus 10 of the present embodiment, the rotation drive device 24 and the axial movement device 40 are controlled in association with each other in step S5, so that the torsion grooves 14a and 14b of the drill 12 are controlled. The spray nozzles 32a and 32b are moved relative to each other, and the abrasive is sprayed over the entire length of the twisted grooves 14a and 14b, so that the polishing process is automatically performed. As a result, as compared with the case where the operator manually polishes, only the surfaces of the twist grooves 14a and 14b are efficiently polished, and a constant polishing quality can be stably obtained.

  Further, by detecting the torsion grooves 14a and 14b by the groove sensor 38, the initial rotation position around the axis S of the drill 12 is automatically adjusted so that the injection nozzles 32a and 32b coincide with the torsion grooves 14a and 14b. Therefore, even when the phase around the axis S of the drill 12 supplied for the polishing process is different, the polishing process can be satisfactorily performed on the twisted grooves 14a and 14b. For this reason, the supply work of the drill 12 becomes easy, the drill 12 can be automatically carried in by the loader / unloader device and the polishing process can be performed, and the polishing process including the supply operation can be completely automated.

  In step S2, the lead L of the torsion grooves 14a and 14b is automatically detected by moving the groove sensor 38 in the axial direction of the drill 12, and in step S5, the rotational drive device 24 and Since the axial movement device 40 is synchronously controlled, even when handling a plurality of types of drills 12 having different torsion grooves 14a and 14b in the lead L, the torsion grooves 14a and 14b of the drills 12 are automatically polished. be able to.

  Further, in this embodiment, a pair of injection nozzles 32a and 32b are provided, and the two torsion grooves 14a and 14b of the drill 12 are simultaneously polished, so that excellent polishing efficiency can be obtained one by one. The polishing time is about ½ compared with the case of polishing.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this is an embodiment to the last, and this invention implements in the aspect which added various change and improvement based on the knowledge of those skilled in the art. Can do.

It is a schematic block diagram explaining the twist groove | channel automatic polishing apparatus which is one Example of this invention. It is a flowchart explaining the action | operation of the twist groove | channel automatic grinding | polishing apparatus of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10: Torsion groove | channel automatic grinding | polishing apparatus 12: Drill (work) 14a, 14b: Torsion groove 24: Rotation drive device 32a, 32b: Injection nozzle 38: Groove sensor 40: Axial direction moving device 42: Electronic control unit S: Workpiece axis Step S2: Lead detection means Step S4: Initial position adjustment means Step S5: Synchronization control means

Claims (4)

A torsion groove automatic polishing apparatus that automatically polishes the surface of the torsion groove by spraying abrasive on the torsion groove provided on the outer peripheral surface of the workpiece,
A spray nozzle that sprays the abrasive toward the workpiece;
A rotation drive device that relatively rotates the workpiece and the injection nozzle around an axis of the workpiece;
An axial movement device for relatively moving the workpiece and the injection nozzle in the axial direction of the workpiece;
Synchronization control means for controlling the rotational drive device and the axial movement device in association with each other so that the spray nozzle is relatively rotated around the axial center along the twisted groove and is relatively moved in the axial direction;
An apparatus for automatically polishing a torsion groove. A groove sensor for detecting a twisted groove of the workpiece;
Initial position adjusting means for adjusting the initial position of the injection nozzle around the axis of the workpiece by the rotary drive device so that the injection nozzle matches the twist groove based on the detection result of the groove sensor; ,
The twisted groove automatic polishing apparatus according to claim 1, comprising: The groove sensor is disposed so as to be relatively movable in the axial direction of the workpiece, and further includes lead detection means for detecting the lead of the twisted groove by relatively moving the groove sensor in the axial direction of the workpiece. And
Based on the lead detected by the lead detection means, the synchronization control means is configured so that the spray nozzle is relatively rotated about the axis along the twist groove and is relatively moved in the axial direction. The rotational drive device and the axial movement device are associated with each other and controlled. The twisted groove automatic polishing device according to claim 2. A plurality of the injection nozzles are arranged around the axis of the workpiece, and a polishing process can be simultaneously performed on a plurality of torsion grooves of the workpiece. 2. A torsion groove automatic polishing apparatus according to item 1.

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