JP2017193007A - Tap-break detection method, multiple-spindle tapping device, and spindle units used for the multiple-spindle tapping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tap-break detection method for multiple-spindle tapping, a multiple-spindle tapping device, and spindle units used for the multiple-spindle tapping device capable of avoiding an increase in size of the device and complication and lowering of processing efficiency, efficiently detecting break of each tap individually, and preventing occurrence of a large amount of defects (unfinished articles).SOLUTION: A tap-break detection method comprises: fixing two or more master metals 3 to an intermediate support body 12 between a driving source 10 and a holding base 11 in a mutually insulated state; providing an insulation connection part 4 in an intermediate part on the driving source 10 side of the male thread part 20 of each master spindle 2; providing detection means 5 for identifiably detecting an energizing state between each master metal 3 and the holding base 11 through a work-piece W for each master metal 3; and determining a tap T attached to the master spindle 2 is broken when there is a master metal 3, a state of which is not detected as energized by the detection means 5 during tapping of the work-piece W.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tap break detection method in a multi-axis tapping process, a multi-axis tapping process apparatus, and a spindle unit used in the multi-axis tapping process apparatus.

  Conventionally, as a multi-axis tapping machine, two or more master spindles that are rotationally driven by a drive source and screw-fed along the axial direction are juxtaposed, and held by a tap that is attached to the tip of each master spindle. Various devices for simultaneously tapping a plurality of workpieces on a table are provided (for example, see Patent Documents 1 and 2). According to such a multi-axis tapping processing apparatus, it is possible to efficiently perform processing on a plurality of parts of the workpiece.

  However, because it is multi-axis, there is a problem that it is difficult to notice even if some taps break during processing, and processing of the next workpiece is continued as it is, resulting in many defective products (unprocessed products). . Multi-axis tapping is often performed in large lots. In such a case, the degree of influence due to the occurrence of defective products (such as reworking work) is large, and as a result, efficiency is significantly reduced.

  As a method for detecting the tap breakage, a method is known in which a determination is made based on fluctuations in the machining load of a motor that is a drive source (see, for example, Patent Document 3). However, most multi-axis tapping machines are configured to simultaneously drive two or more master spindles via gears or the like by the driving force of a common motor (drive source), and thus the driving force is increased to two or more. If it is divided, the loss of driving force such as gears is large, and it is difficult to determine the breakage of taps due to variations in machining load. Of course, it is not possible to individually recognize the breakage of each tap.

  On the other hand, there has been proposed an apparatus for separately providing an inspection tool to be inserted into a processed hole of a processed workpiece, and detecting the folding of the tap by the operation of these inspection tools (see, for example, Patent Document 4). .) However, such a device requires a check tool, its driving mechanism, a sensor, and the like in addition to the master spindle, so that the device becomes large and complicated, the cost increases, and a decrease in production efficiency is unavoidable.

Japanese Utility Model Publication No. 4-47919 JP 2000-190129 A JP-A-8-267321 JP-A-8-174382

  Therefore, in view of the above-described situation, the present invention is to solve the problem of increasing the size and complexity of the apparatus and reducing the processing efficiency, and at the same time, can detect the breakage of each tap individually and efficiently. The object is to provide a multi-axis tapping processing tapping detection method, a multi-axis tapping processing apparatus, and a spindle unit used therefor that can prevent the occurrence of a large amount of defective products (unprocessed products).

  In order to solve the above-mentioned problems, the present invention has two or more master spindles that are rotationally driven by a common drive source and screw-fed along the axial direction, and are mounted on the tip of each master spindle. A tap fold detection method in multi-axis tapping that simultaneously performs tapping at a plurality of positions on a work piece on a holding table, wherein each master spindle is attached to an intermediate support between the drive source and the holding table. Two or more master metals that are screwed into the male screw portion and support the master spindle so as to be screw-feedable are fixed in a state of being electrically insulated from each other, and in the middle of the drive screw side from the male screw portion of each master spindle, Insulating connecting portions for connecting the axially distal end side and proximal end side to each other in an electrically insulated state are provided, respectively, between each master metal and the holding base. When there is a master metal in which an energized state is not detected by the detecting unit when tapping a work having electrical conductivity, a detecting means for detecting the energized state through the workpiece for each master metal is provided. Provided is a tap break detection method for determining that a tap mounted on the master spindle is broken.

  In the present invention, two or more master spindles that are rotationally driven by a common drive source and screw-fed along the axial direction are arranged side by side, and a tap attached to the tip of each master spindle is used on the holding table. Two or more multi-axis tapping machines that simultaneously tapping a plurality of parts of a workpiece, and are screwed onto a male thread portion of each master spindle on a common intermediate support to support the master spindle in a screw feedable manner. Insulating connection that fixes the master metal in an electrically insulated state to each other, and connects the axially distal end side and the proximal end side to each other in an electrically insulated state from the male threaded portion of each master spindle to the middle of the drive source side Provided with a detecting means for detecting the energized state between each master metal and the holding base in an identifiable manner for each master metal. Also provides multi-axis tapping device according to claim.

  Here, when there is a master metal whose energization state is not detected at the time of tapping by the detecting means, there is provided a tap fold determining means for determining that a specific tap mounted on the master spindle is broken. Are preferred.

  The intermediate support is preferably made of a fixing plate made of an electrically insulating material provided with two or more mounting holes for fixing each master metal in a penetrating state.

  Furthermore, it is preferable that the master spindle includes an extendable rod portion on the drive source side of the male screw portion, and the insulating connecting portion is provided on the drive source side of the extendable rod portion.

  In particular, the telescopic rod portion is configured by combining a sleeve having an axially long ridge on the inner peripheral surface and a shaft body having an outer peripheral surface provided with a recess that engages with the sleeve. What provided the said insulation connection part so that it may continue to the edge part on the opposite side to the side where the said shaft body extends is preferable.

  Further, the master spindle is between the telescopic rod part and the male screw part, and between the telescopic rod part and an attachment part that is detachably attached to one of two or more output shafts of the drive source, It is preferable that each includes a universal joint, and the insulating coupling portion is provided between an end portion of the telescopic rod portion facing the universal joint on the attachment portion side and the universal joint.

  Moreover, what provided the connection terminal part of the electrical wiring as said detection means in the outer peripheral part of each master metal is preferable.

  The present invention also relates to a spindle unit used in the above-described multi-axis tapping apparatus according to the present invention, wherein the master spindle having a tap attached to a tip end portion and the male screw portion of the master spindle are screwed into the master spindle. A master metal that supports the spindle so as to be screw-feedable, the master metal being fixed to the intermediate support body, and an axial front end side and a middle part on the drive source side from the male screw part of the master spindle; There is also provided a spindle unit provided with an insulating connecting portion for connecting the base end sides to each other in an electrically insulated state.

  Here, it is preferable that the master spindle includes a telescopic rod portion closer to the drive source than the male screw portion, and the insulating connecting portion is provided closer to the drive source than the telescopic rod portion.

  Further, the telescopic rod portion is configured by combining a sleeve provided with a long ridge in the axial direction on the inner peripheral surface and a shaft body provided with a concave ridge that engages with the sleeve on the outer peripheral surface. What provided the said insulation connection part so that it may continue to the edge part on the opposite side to the side where the said shaft body extends is preferable.

  Further, the master spindle is between the telescopic rod part and the male screw part, and between the telescopic rod part and an attachment part that is detachably attached to one of two or more output shafts of the drive source, It is preferable that each includes a universal joint, and the insulating coupling portion is provided between an end portion of the telescopic rod portion facing the universal joint on the attachment portion side and the universal joint.

  In addition, the insulating connecting portion opens and attaches a bottomed or penetrating attachment hole to be attached in a state where the distal end side member end portion and the proximal end side member end portion are respectively inserted in both axial end surfaces. Electrical insulating materials each having pin holes communicating with through-holes penetrating in the lateral direction intersecting the axial direction formed in the end portions of the members attached to the mounting holes on the both end faces on the side wall portions around the holes What consists of a cylindrical body made from a product and the fixed pin attached to the said pin hole is preferable.

  Moreover, what provided the connection terminal part of the electrical wiring as said detection means in the outer peripheral part of the said master metal is preferable.

  According to the present invention as described above, two or more master metals are fixed to the intermediate support body in a state of being electrically insulated from each other, and in the middle portion on the drive source side from the male screw portion of each master spindle, Insulating connecting portions for connecting the base end sides to each other in a state of being electrically insulated from each other, and detecting means for detecting the energized state through the workpiece between each master metal and the holding base in a distinguishable manner for each master metal When tapping a workpiece having electrical conductivity, if there is a master metal whose detection state is not detected by the detection means, it can be determined that the tap attached to the master spindle is broken. .

In other words, even in multi-axis tapping processing driven by a common drive source, it is possible to individually detect the tap breakage of each tapping spindle, and focusing on the master metal, the configuration is energized between this and the work table. In addition, since it can be realized simply by electrically insulating the middle part on the drive source side from the male screw part of each master spindle and determining the energized state by the detection means, the size and complexity of the apparatus and the associated high cost are avoided. be able to. And even if it is multi-axis, if some taps break during machining, it can be immediately noticed and dealt with, so it is possible to replace the broken tap immediately before continuing the machining of the next workpiece Thus, a large amount of defective products (unprocessed products) can be prevented in advance. That is, even during parts large-lot tap processing, the broken state of each tap is detected individually, and defective products that have not been partially processed (unprocessed products) flow out in large quantities to the post-process and customer. This can be prevented and the production efficiency can be significantly increased.

  In addition, when there is a master metal whose energization state is not detected at the time of tapping by the detecting means, the computer is provided with a tap fold determining means for determining that a specific tap mounted on the master spindle is broken. The automatically broken tap can be reliably identified.

  Further, in the case where the intermediate support is made of a fixing plate made of an electrically insulating material provided with two or more mounting holes for fixing each master metal in a penetrating state, the master metal itself does not have a special insulating structure. Two or more master metals can be efficiently fixed in an insulated state.

  Further, in the case where the master spindle is provided with a telescopic rod portion on the drive source side from the male screw portion and the insulating connecting portion is provided on the drive source side with respect to the telescopic rod portion, this is arranged on the tap side on the tip side from the telescopic rod portion. Since there is no need to provide such an insulating connecting portion, the minimum necessary head portion can be efficiently screwed.

  Further, the telescopic rod portion is configured by combining a sleeve having a long ridge in the axial direction on the inner circumferential surface and a shaft body having a concave in the outer circumferential surface to be engaged with the sleeve. In the case where an insulating connecting part is provided so as to be continuous with the end opposite to the extending side, such an insulating connecting part is set on the male screw part side set exclusively for the pitch of the attached tap. Therefore, it is possible to perform the efficient screw feeding and to adopt a known configuration on the shaft body side, and it is possible to use a known component as it is.

  In addition, the master spindle includes universal joints between the telescopic rod portion and the male screw portion, and between the telescopic rod portion and an attachment portion that is detachably attached to one of two or more output shafts of the drive source. In the case where the insulating coupling portion is provided between the end of the telescopic rod portion facing the universal joint on the attachment portion side and the universal joint, the male screw portion side including the universal joint shall be a known configuration. It is possible to use a known part with a universal joint as it is.

  In addition, in the case where the connection terminal part of the electrical wiring as the detection means is provided on the outer peripheral part of each master metal, a circuit that individually energizes between each master metal and the holding base from the connection terminal part can be easily configured. The energized state can be easily detected for each master metal.

  In addition, the insulating connecting portion opens a bottomed or penetrating mounting hole to be attached in a state where the distal end side member end portion and the proximal end side member end portion are respectively inserted in both axial end surfaces, and the mounting hole Made of an electrically insulating material, each having a pin hole communicating with a through-hole penetrating in a lateral direction intersecting an axial direction formed in an end portion of the member to be attached to an attachment hole on each of the both end faces, In this case, the distal end side member and the proximal end side member can be easily connected to each other while being reliably transmitted without being displaced.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows the schematic structure of the whole multi-axis tapping apparatus based on typical embodiment of this invention. The perspective view which shows the schematic structure of the whole multi-axis tapping apparatus similarly. The longitudinal cross-sectional view which shows the principal part of a multi-axis tapping processing apparatus similarly. The perspective view which similarly shows the spindle unit of a multi-axis tapping processing apparatus. The disassembled perspective view which shows the principal part of a spindle unit similarly. The longitudinal cross-sectional view which shows the principal part of a spindle unit similarly. The disassembled perspective view which shows the principal part of a spindle unit similarly.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the multi-axis tapping apparatus 1 according to the present invention is driven by a common drive source 10 and is rotated by two or more master spindles 2 screwed along the axial direction. Are arranged in parallel, and a tapping process is simultaneously performed at a plurality of positions of the workpiece W on the holding table 11 by taps T attached to the front ends of the master spindles 2. Although only two master spindles 2 are shown in the figure and others are omitted, three or more master spindles are provided. However, the number of master spindles 2 is not particularly limited as long as it is two or more, and even two master spindles 2 are included in the multi-axis tapping apparatus according to the present invention.

  In the present invention, two or more master metals 3 that are screwed into the male screw portions 20 of the respective master spindles 2 to support the master spindles 2 so as to be capable of screw feed are electrically insulated from each other on a common intermediate support 12. Insulating connecting portions 4 that are fixed in a state and connect the axially distal end side and the proximal end side to each other in a state of being electrically insulated from each other on the drive source 10 side of the male screw portion 20 of each master spindle 2. Furthermore, a detecting means 5 is provided for detecting the energized state between each master metal 3 and the holding base 11 in a distinguishable manner for each master metal 3.

  In such a multi-axis tapping apparatus 1 according to the present invention, if there is a master metal 3 whose energization state is not detected by the detecting means 5 when tapping a work W having electrical conductivity, the spindle of the master metal 3 is present. It can be determined that the tap T attached to the unit 13 is broken, and the tapping spindle tap breakage can be detected individually. The determination of the tap breakage based on the detection means 5 is based on the condition that the workpiece W has electrical conductivity.

  The multi-axis tapping apparatus 1 is supported by a base table 14 that supports the holding table 11 so that the holding table 11 can be moved up and down, and a plurality of vertical frames 15 (14A to 14D) that extend upward from the base table 14. A substantially horizontal mounting base 16 for mounting the mechanism 70 on the upper surface side, a plurality of substantially horizontal horizontal frames 17 (17A to 17D) for connecting adjacent vertical frames 15 at midway positions of the vertical frame 15, and these horizontal frames 17 is provided with a substantially horizontal fixing plate 121 provided between at least a pair of opposed horizontal frames 17 (between 17A and 17C in this example). In this embodiment, a vertical type in which the tap is moved up and down is illustrated, but it is naturally possible to have the same configuration in the horizontal direction and the diagonal direction instead of the vertical direction.

  The holding table 11 includes a lifting platform 110 that is moved up and down by the lifting mechanism 18 and a support member 111 that is fixed to the upper surface of the lifting platform 110 and supports the workpiece W. The elevator 110 and the support member 111 are made of an electrically conductive metal material, and an electrical wiring 52 to be described later is connected to the elevator 110. Reference numeral 19 denotes a locking stand that is fixed to the upper surface of the base base 14 and stops against the upper surface of the lifting / lowering base 110 to restrict downward movement.

  The workpiece W moves up and down together with the holding table 11, and the distance from the fixed plate 121 to which the master metal 3 of the spindle unit 13 is fixed is adjusted. When replacing the workpiece W before and after the machining, the holding table 11 is lowered to a position where it comes into contact with the lower lifting table 110, and the replacement work is facilitated. When machining, the distance is raised to an appropriate distance for machining.

  The elevating mechanism 18 is fixed to a support base 180 extending downward from the lower surface of the base base 14 and a hydraulic / pneumatic cylinder 181 fixed with the telescopic rod 181a facing downward, and fixed to the distal end of the telescopic rod 181a. And a plurality of connecting rods 183 that extend upward from the moving plate 182 and pass through the support base 180, the base base 14, and the stopper base 19 and are attached to the lower surface of the lifting / lowering base 110. Yes.

  The drive source 10 is an electric motor in this example, but is not particularly limited thereto. Further, the transmission mechanism 70 includes a plurality of gears that decelerate the driving force of the driving source 10 and distribute it to two or more output shafts 71. The output shaft 71 is provided in a state protruding from the lower surface side of the mounting base 16. Since the output shafts 71 rotate in synchronization with each other, the master spindles 2 attached to these output shafts 71 also rotate in the same manner, and a plurality of taps T attached to the tips allow a plurality of positions of the workpiece W to be obtained. Are processed simultaneously.

  The intermediate support 12 includes a receiving frame 120 made of the horizontal frame 17 (17A to 17D) and the fixed plate 121. The fixed plate 121 includes a master metal 3 as shown in FIG. Two or more mounting holes 121a are provided for fixing in a state of penetrating through. Since the fixing plate 121 is made of an electrically insulating material such as polyacetal resin (POM resin), the master metals 3 fixed to the fixing plate 121 are electrically insulated from each other. In addition to the intermediate support 12 made of an electrically insulating material, the intermediate support 12 is made of an electrically conductive material such as a metal and insulated by interposing an insulating sheet or the like between the mounting hole 121a and the master metal 3. Of course it is also possible.

  The master metal 3 is composed of a sleeve main body 32 having a female screw portion 32a for screwing into the male screw portion 20 of the master spindle 2 and feeding the screw, and as shown in FIG. The flange part 30 for attachment is formed in the edge part of (). Mounting plates 31 having through-holes 31 a through which mounting screws 122 for fixing to the fixing plate 121 are inserted are mounted on the flange portion 30 at the top and bottom of the flange portion 30.

  The master metal 3 is inserted into the mounting hole 121a from the lower surface side of the fixed plate 121 in a state where the upper mounting plate 31 is interposed between the fixed plate 121 and the flange portion 30, and the through holes of both the mounting plates 31 are inserted. The fixing screw 122 penetrating 31a is screwed into a screw hole 121b formed around the mounting hole 121a, whereby the fixing plate 121 is fixed. Master metal 3 is made of a metal material having electrical conductivity as in the prior art,

  Each master metal 3 is supported so that the master spindle 2 can be screw-fed by screwing the male screw portion 20 into the female screw portion 32a of the master metal 3, and the multi-spindle tapping machine 1 includes these master spindles 2. Two or more spindle units 13 in combination with the master metal 3 are provided. The master spindle 2 functions as a rotation transmission part of the spindle unit 13.

  As shown in FIG. 4, the master spindle 2 includes a telescopic rod portion 21 on the proximal end side with respect to the male screw portion 20 screwed into the master metal 3, and between the telescopic rod portion 21 and the male screw portion 20, and the telescopic portion. Universal joints 23A and 23B are provided between the rod portion 21 and the attachment portion 22 that is detachably attached to the output shaft 71 on the proximal end side. That is, the length of the spindle unit 13 is variable by the telescopic rod portion 21, and the angle is also variable by the universal joints 23A and 23B. Constituent members excluding the insulating connecting portion 4 of the master spindle 2, and members on the tip side including at least the male screw portion 20 (such as the chuck portion of the tap T) are made of an electrically conductive metal material as in the prior art. The work piece W can be energized from the master metal 3 through a tap T made of a conductive metal material.

  The master metal 3 (and the mounting hole 121a of the intermediate support 12) is provided at a position corresponding to the machining position of the workpiece W, but the spindle unit 13 is configured to be variable in length and angle as described above. Thus, even if the position of the output shaft 71 is not adjustable (fixed position), the spindle unit 13 having the same structure can be mounted between each output shaft 71 and the master metal 3 to function. As shown in FIG. 6, the telescopic rod portion 21 includes a sleeve 210 in which a long ridge 210 a is provided on the inner peripheral surface in the axial direction, and a shaft body 211 in which a concave ridge 211 b is provided on the outer peripheral surface. Are combined.

  As shown in FIG. 4, a shaft on the drive source side from the male screw portion of the master spindle 2, in this example, an end portion 21 b facing the universal joint 23 </ b> B on the attachment portion 22 side of the telescopic rod portion 21, An insulating connecting portion 4 is provided for connecting the direction front end side and the base end side in a state of being electrically insulated from each other.

  Specifically, as shown in FIGS. 6 and 7, the insulating connecting portion 4 includes a tubular body 40 made of an electrically insulating material and fixing pins 41 and 42. The cylindrical body 40 has a distal end side member end portion (end portion 21b of the telescopic rod portion 21) and a proximal end side member end portion (end portion 23b of the universal joint 23B) respectively inserted into both axial end surfaces. An attachment hole 43 that is attached to the state and penetrates in the axial direction is opened. The member end portions 21 b and 23 b are attached to the inside of the attachment hole 43 in a state of being separated from each other, and are connected to each other through the insulating connection portion 4 so as to be electrically insulated from each other. The attachment hole 43 is a through-hole, but may be constituted by a pair of bottomed holes that open at both end faces.

  Pin holes 45, 46 communicating with the through holes 21 c, 23 c penetrating in the lateral direction intersecting the axial direction formed in the member end portions (21 b, 23 b), respectively, on the side wall portion 44 around the mounting hole 43. Are formed at axial positions corresponding to the through holes 21c and 23c, respectively. Then, by inserting the fixing pin 41 into the pin hole 45 and the through hole 21c, the member end 21b and the cylindrical body 40 are connected to each other, and the fixing pin 42 is inserted into the pin hole 46 and the through hole 23c. Thereby, the member end 23b and the cylindrical body 40 are connected to each other.

  Thereby, the tubular body 40 of the insulating connecting portion 4 is connected so as to be continuous with the end portion 210b of the sleeve 210. At the positions where the pin holes 45, 46 of the cylindrical body 40 are opened, annular recesses 47, 48 to which C-shaped retaining rings 49 are respectively attached are formed, and are inserted into the pin holes 45, 46. The fixed pins 41, 42 are prevented from coming off by retaining rings 49 attached to the annular recesses 47, 48. Each of the member end portions 21b and 21c is composed of rod-like end portion constituting members 24 and 25, and the end portion 210b of the sleeve 210 and the end of the sleeve 230 constituting the universal joint 23B, respectively, by the structure of the same fixing pin and pin hole. It is fixed to the portion 230b.

  A connecting terminal portion 8 for electrical wiring as the detecting means 5 is provided on the outer peripheral portion (the outer peripheral surface 32b on which the sleeve body 32 protrudes) of the portion of the master metal 3 protruding upward from the intermediate support 12 (fixed plate 121). It has been. As shown in FIG. 5, the connection terminal portion 8 includes a main body portion 80 provided with screwing portions (attachment screws 801 and screw holes 800) for screwing the terminal portions 510 of the electric wiring 51, and the main body portion 80. It is composed of a substantially U-shaped member as seen from the axial direction, comprising gripping pieces 81 and 81 extending so as to sandwich the outer peripheral surface 32b of the master metal 3 from both ends.

  The gripping pieces 81 and 81 are each provided with a screw hole 810 penetrating toward the outer peripheral surface 32b. It is fixed on 32b. Since it is such a substantially U-shaped member, it can be easily fixed to the master metal 3 after the spindle unit 13 is attached.

  The detecting means 5 includes two or more electric wires 51 electrically connected to each master metal 3, an electric wire 52 connected to the lifting platform 110 of the holding base 11, and each master metal through these electric wires 51, 52. 3—Equipped with a detecting device 50 that energizes between the elevators 110 and detects each energized state in an identifiable manner. The detection device 50 is configured by a computer having a power source for energization and control, and is configured by a programmable logic controller (PLC) in this example.

  Further, when there is a master metal 3 whose energization state is not detected during tapping by the detection means 5, the tap fold determination means for determining that the specific tap T mounted on the master spindle 2 is broken. 6 is provided. Such determination means 6 may be provided in the detection device 50 (PLC), or may be constituted by another computer connected to the detection device 50. Furthermore, it is preferable to provide a notification means that issues an alarm based on the determination result of the determination means 6 and stops the machining operation or displays a spindle unit with a broken tap.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Multi-axis tapping machine 2 Master spindle 3 Master metal 4 Insulation connection part 5 Detection means 6 Judgment means 8 Connection terminal part 10 Drive source 11 Holding stand 12 Intermediate support 13 Spindle unit 14 Base stand 15 (15A-15D) Vertical frame 16 Mounting base 17 (17A-17D) Horizontal frame 18 Elevating mechanism 19 Stopper base 20 Male thread part 21 Telescopic rod part 21b End part 21c Through hole 22 Mounting part 23A, 23B Universal joint 23b End part 23c Through hole 24, 25 End part Component member 30 Flange portion 31 Mounting plate 31a Through hole 32 Sleeve body 32a Female thread portion 32b Outer peripheral surface 40 Cylindrical body 41, 42 Fixing pin 43 Mounting hole 44 Side wall portion 45, 46 Pin hole 47, 48 Annular recess 49 Retaining ring 50 Detector 51 Electrical wiring 5 2 Electrical Wiring 70 Transmission Mechanism 71 Output Shaft 80 Main Body 81 Grasping Piece 110 Lifting Base 111 Support Member 120 Receiving Frame 121 Fixing Plate 121a Mounting Hole 121b Screw Hole 122 Mounting Screw 180 Supporting Stand 181 Cylinder 181a Telescopic Rod 182 Moving Plate 183 Connecting Rod 210 Sleeve 210a Convex 210b End 211 Shaft 211b Concave 230 Sleeve 230b End 510 Terminal 800 Screw hole 801 Mounting screw 810 Screw hole 811 Tightening screw T Tap W Workpiece

Claims (14)

Two or more master spindles that are rotationally driven by a common drive source and screw-fed along the axial direction are arranged side by side, and taps that are attached to the tips of the master spindles are used at multiple locations on the workpiece on the holding table. A tap fold detection method in multi-axis tapping that performs tapping at the same time,
Two or more master metals that are screwed into the male screw portion of each master spindle and supported so that the master spindle can be screw-fed to an intermediate support body between the drive source and the holding table are electrically insulated from each other And fix each with
Insulating connecting portions for connecting the axially distal end side and the proximal end side to each other in a state of being electrically insulated from each other are provided in the middle portion on the drive source side from the male screw portion of each master spindle,
A detecting means for detecting the energized state through the workpiece between each master metal and the holding base in an identifiable manner for each master metal,
A tap fold detection method for determining that a tap mounted on a master spindle is broken when there is a master metal whose energization state is not detected by the detection means when tapping a workpiece having electrical conductivity. Two or more master spindles that are rotationally driven by a common drive source and screw-fed along the axial direction are arranged side by side, and taps that are attached to the tips of the master spindles are used at multiple locations on the workpiece on the holding table. A multi-axis tapping machine that performs tapping at the same time,
Two or more master metals that are screwed onto the male thread portion of each master spindle and support the master spindle so as to be able to be screwed on a common intermediate support are fixed in a state of being electrically insulated from each other,
Insulating connecting portions for connecting the axially distal end side and the proximal end side to each other in a state of being electrically insulated from each other are provided in the middle portion on the drive source side from the male screw portion of each master spindle,
A multi-axis tapping apparatus comprising a detecting means for detecting an energized state between each master metal and the holding table so as to be distinguishable for each master metal.   A tap fold determining means for determining that a specific tap mounted on the master spindle is broken when there is a master metal whose energized state is not detected during tapping by the detecting means. The multi-axis tapping machine according to 2.   The multi-axis tapping apparatus according to claim 2 or 3, wherein the intermediate support is made of a fixing plate made of an electrically insulating material having two or more mounting holes for fixing each master metal in a penetrating state.   The multi-axis tapping according to any one of claims 2 to 4, wherein the master spindle is provided with a telescopic rod portion on the drive source side of the male screw portion, and the insulating connecting portion is provided on the drive source side of the telescopic rod portion. Processing equipment. The telescopic rod portion is configured by combining a sleeve provided with a long ridge in the axial direction on the inner peripheral surface and a shaft body provided with a concave ridge to be engaged with the sleeve.
The multi-axis tapping apparatus according to claim 5, wherein the insulating connecting portion is provided so as to be continuous with an end portion of the sleeve opposite to a side on which the shaft body extends. The master spindle is freely between the telescopic rod portion and the male screw portion, and between the telescopic rod portion and a mounting portion that is detachably attached to one of two or more output shafts of the drive source. With fittings,
The multi-axis tapping apparatus according to claim 5 or 6, wherein the insulating connecting portion is provided so as to be continuous with an end portion of the telescopic rod portion facing the universal joint on the attachment portion side.   The multi-axis tapping apparatus according to any one of claims 2 to 7, wherein a connecting terminal portion of electric wiring as the detecting means is provided on an outer peripheral portion of each master metal. A spindle unit used in the multi-axis tapping apparatus according to any one of claims 2 to 8,
The master spindle to which a tap is attached at the tip;
The master metal that is screwed into the male screw portion of the master spindle and supports the master spindle so as to be capable of being screw-feeded, and includes a master metal that is fixed to the intermediate support,
A spindle unit in which an insulating connecting portion for connecting the axially distal end side and the proximal end side to each other in an electrically insulated state is provided midway on the drive source side from the male screw portion of the master spindle. The master spindle has a telescopic rod portion on the drive source side from the male screw portion,
The spindle unit according to claim 9, wherein the insulating connecting portion is provided closer to the drive source than the telescopic rod portion. The telescopic rod portion is configured by combining a sleeve provided with a long ridge in the axial direction on the inner peripheral surface and a shaft body provided with a concave ridge to be engaged with the sleeve.
The spindle unit according to claim 10, wherein the insulating connection portion is provided so as to be continuous with an end portion of the sleeve opposite to a side on which the shaft body extends. The master spindle is freely between the telescopic rod portion and the male screw portion, and between the telescopic rod portion and a mounting portion that is detachably attached to one of two or more output shafts of the drive source. With fittings,
The spindle unit according to claim 10 or 11, wherein the insulating connecting portion is provided between an end portion of the telescopic rod portion facing the universal joint on the attachment portion side and the universal joint. The insulating connecting portion is
Opening a bottomed or penetrating mounting hole to be attached in a state where the distal end side member end and the proximal end side member end are respectively inserted on both end surfaces in the axial direction, and on the side wall portion around the mounting hole, A cylindrical body made of an electrically insulating material, each provided with a pin hole communicating with a through-hole penetrating in a lateral direction intersecting the axial direction formed in the end portion of the member attached to the attachment holes on the both end faces;
The spindle unit according to any one of claims 9 to 12, further comprising a fixing pin attached to the pin hole.   The spindle unit according to any one of claims 9 to 13, wherein a connecting terminal portion of electric wiring as the detecting means is provided on an outer peripheral portion of the master metal.

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