JP2016179529A - Pressure air measurement device and tool machine system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure air measurement device which can exactly measure a state of pressure air even if burrs are generated at an attachment/detachment face of a spindle, and scatters and recesses are formed thereon, in the pressure air measurement device which detects the clogging of an air path for blowing out pressure air which is arranged at the spindle in order to clean an attachment/detachment part of a processing tool which is attachable and detachable to/from the spindle of a machine tool.SOLUTION: A flange end of a holder part of a pressure air measurement device which abuts on a spindle of a machine tool is constituted of an exchangeable elastic member. The elastic member has a flow passage communicating with a pressure air measurement part, and prevents air leakage between the spindle and the holder part.SELECTED DRAWING: Figure 1

Description

  The present invention is on the main shaft side for cleaning the flange end face portion of the detachable portion that comes into contact with the main shaft by blowing out pressure air when a machining tool including a member for holding a drill or the like is mounted on the main shaft of the machine tool. The present invention relates to a pressure air measuring device that detects clogging of an air path.

  In general, a machine tool such as a machining center has a mechanism for holding a machining tool via a member held on the inner peripheral surface of a spindle, and the machining tool is provided with an attachment / detachment portion that can be attached and detached. A required tool is selected by an automatic transfer device from a magazine in which a plurality of tools for processing are arranged, and is mounted on the main shaft for processing.

  With the introduction of such automatic tools such as an auto tool changer at the machining center, the automation of machining has progressed dramatically, and the frequency of exchanging machining tools to the spindle has increased significantly. It is very important that the flange end face part of the detachable part that contacts the spindle during automatic replacement is cleaned with pressure air blown from the spindle side when the machining tool is replaced, and there is no adhesion of foreign matter. is there.

  If the pressure air flow path provided in the spindle of such a machine tool is clogged or the pressure air supply source is obstructed, the cleaning will not be performed sufficiently and the spindle and machining tool will not be cleaned. There is a possibility that foreign matter exists in the workpiece, and an error occurs in the holding posture dimension of the machining tool, which affects the machining accuracy.

  Conventionally, Patent Document 1 is disclosed as an object to detect clogging of the flow path of this pressure air. There, the pressure or flow rate of the air supplied from the pressure air supply source to the air supply flow path is measured to determine whether or not the machining tool is mounted, and in the state where the taper shank for detachment is clamped, The pressure or flow rate of the air in the blowout hole is measured, and the presence or absence of mounting failure is determined by comparing the value with a good mounting state measured in advance.

Japanese Patent No. 4896580

  However, in the case of detecting clogging of the flow path of the pressure air provided on the spindle of the machine tool disclosed in Patent Document 1, the state of the pressure can be constantly monitored because the measurement of the air pressure and flow rate is performed on the spindle side. However, since the structure is complicated and an auxiliary device that is not the purpose of the original processing is attached, there are problems such as cost increase due to a complicated mechanism and complicated maintenance work. In addition, in order to determine the presence or absence of clogging, it is necessary to set a condition for the determination reference value, and fine adjustments such as a delay timing for measuring air pressure and flow rate are required.

  On the other hand, as shown in FIGS. 4 and 5, conventional pressure air that has a detachable portion as in the processing tool, is attached to the spindle 100 of the machine tool, and visually detects clogging of the flow path of pressure air. Measuring devices are known and used. FIG. 4 is a perspective view of the configuration of a conventional pressure air measuring device and a main shaft, and FIG. 5 schematically shows the conventional pressure air measuring device after measuring pressure air. The conventional pressure air measuring device is connected to the holder portion 2 at a position corresponding to the first flow path 101 for blowing out pressure air provided on the main shaft 100, and the pressure air measuring section 41 has a flow path. And a piston 43 slidable in the cylinder interior 45. The pressure air supplied to the air flow path from the pressure air supply source on the main shaft side reaches the inside of the cylinder from the main shaft 100 side, pushes out the slidable piston 43, and the pressure at the distance or movement of the piston 43 at that time The state of air can be detected.

  The flange end surface 2d of the pressure air measuring device is in contact with the mounting surface 102 of the spindle 100 of the machine tool, and the pressure air measuring device is firmly attached. The environment in which the spindle 100 of the machine tool is placed is a space where coolant mist, cutting metal powder, etc. flies, and there are frequent tool changes resulting in burrs on the mounting surface 102, scratches and dents. It ’s done. When the pressure air measuring device is mounted on the main shaft 100 in such a state, a gap is generated between the mounting surface 102 and the flange end surface 2d, and air leakage occurs, resulting in erroneous detection. Further, the flange end surface 2d of the flange end 2c on the pressure air measuring device side is also damaged, and an air leakage channel is formed on the flange end surface 2d. It was a cause of detection.

  The present invention compensates for the above-mentioned drawbacks, and also when a pressure air measuring device is mounted to measure the pressure air state when burrs or dents are generated on the machining tool mounting surface of the spindle of the machine tool. An object of the present invention is to obtain a pressure air measuring device that can prevent erroneous detection due to air leakage.

The pressure air measurement device according to the present invention measures the state of pressure air blown from the first flow path provided on the spindle of the machine tool to the attachment / detachment portion of the machining tool that can be attached to and detached from the spindle. In the device, the pressure air measuring device is
A holder portion having a flange end detachably contacting the main shaft and a second flow path connected to the first flow path;
A pressure air measuring unit provided with means for measuring at least one of pressure and flow rate of the pressure air connected to the holder unit;
Have
The flange end is configured by an exchangeable elastic member that forms a part of the second flow path.

  Moreover, it is preferable that all or part of the elastic member is composed of any one of nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, silicone rubber, and chloroprene rubber.

  A machine tool system according to the present invention includes a machine tool provided with a first flow path in a main shaft for blowing pressure air to an attaching / detaching portion of the processing tool when a processing tool detachable from the main shaft is attached to or detached from the main shaft. The pressure air measuring device is mounted on the main shaft.

  With this configuration, even when burrs or dents are generated on the machining tool mounting surface of the main spindle of the machine tool, the elastic member is deformed to ensure adhesion between the main spindle and the portion for measuring the pressure air. Therefore, it is possible to prevent erroneous detection due to air leakage when the pressure air measuring device is mounted and the pressure air state is measured. In addition, since the elastic member can be easily replaced, it is possible to always maintain good adhesion between the main shaft and the pressure air measuring device by periodic replacement.

FIG. 1 is an external perspective view showing a main body of a pressure air measuring device and a machine tool showing an embodiment of the present invention. Sectional drawing of the pressure air measuring apparatus which showed embodiment of this invention 1 is a perspective configuration diagram of a machine tool system showing an embodiment of the present invention. Configuration perspective view of conventional pressure air measuring device and spindle Configuration perspective view of conventional pressure air measuring device and spindle

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

  FIG. 1 is an external perspective view showing a schematic positional relationship between a pressure air measuring device showing an embodiment of the present invention and a spindle of a machine tool. FIG. 2 is a cross-sectional view of the pressure air measuring device 1 cut at the center. With reference to FIGS. 1-2, embodiment of the pressure air measuring apparatus 1 of this invention is described. In addition, although the pressure air measuring apparatus 1 of this invention replaces the mechanical part of the conventional embodiment shown in FIG.4 and FIG.5 with the electrical thing, it is not limited to this.

  The holder part 2 is composed of a taper shank 2a and a flange 2b, and the pressure air measuring device 1 can be attached to and detached from the spindle 100 of the machine tool via the holder part 2 similar to the attaching / detaching part of the machining tool. is there.

  4 and 5 of the conventional example, the tapered shank 2a is drawn into the main shaft 100, and is constrained to the main shaft 100 by two-surface restraint of the tapered surface of the tapered shank 2a and the flange end surface 2d of the flange end 2c. In this embodiment, a two-surface constrained modular taper holder according to JIS B 6065-1 and 2 standards is used, but other two-surface constrained holders can also be implemented.

  The flange 2b has a flange end 2c in contact with the mounting surface 102 of the main shaft 100 and is connected to the tapered shank 2a. This holder portion 2 is the same as that in the processing tool stored in the tool magazine in the auto tool changer selected and replaced according to the desired processing content of the machining center, and the pressure air of the present invention. The measuring apparatus 1 also has this.

  The portion of the flange 2b that contacts the main shaft 100 is the flange end 2c, and an elastic member 2e is provided at the surface facing the main shaft 100, and the surface in contact with the main shaft 100 is the flange end surface 2d. The elastic member 2e in the present embodiment uses two arc-shaped nitrile rubber flat plates. The material of the elastic member 2e is not limited to this, but since it is an environment in which coolant or the like is scattered, it has oil resistance such as nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, silicone rubber, chloroprene rubber and is airtight. What is kept is preferred. The elastic member 2e is fixed by a screw 10 to form a flange end 2c, and a part of the second flow path 202 corresponding to the first flow path 101 of the main shaft 100 is provided. The elastic member 2e only needs to have all or part of elasticity such as the rubber described above, and a configuration in which outsert molding or insert molding of a metal plate is also possible. Further, the shape can be appropriately modified depending on the number of flow paths of the pressure air.

  The cover case 3 has a disc shape, is provided to face the pressure air measurement unit 4 so as to cover the members inside the pressure air measurement device 1, and the airtightness is maintained by the O-ring 8. Since the pressure air measuring device 1 is used in a machine tool such as a machining center, it is an environment in which coolant and chips are scattered, and it is necessary to maintain airtightness for protecting an electric circuit and the like from these.

  The pressure air measurement unit 4 is connected to the holder unit 2 via a connection member 13 described later, has eight air flow paths, and stores members for detecting pressure air and the like. The pressure air measuring unit 4 has, for example, a cup shape and is made of an aluminum alloy A6061 to prevent corrosion due to coolant or the like. In FIG. 2, two of the eight channels are shown in cross section, but all the eight channels have the same shape and are radially formed around the central axis of the cup-shaped pressure air measuring unit 4. Has been.

  Starting from the flange end surface 2d, a second flow path 202 is provided in the axial direction corresponding to each of the eight systems of the first flow paths 101. The second flow path 202 is linear and is provided in communication.

  The holder part 2 and the pressure air measurement part 4 are being fixed with the volt | bolt via the connection member 13 in the middle. The boundary is airtight. The connection member 13 is a disk-shaped plate made of an elastic body such as rubber, and is provided with a hole for connecting the second flow path 202 of the holder part 2 and the third flow path 203 of the pressure air measurement part 4. Thus, the elastic body serves as a packing and is kept airtight. In the present embodiment, a series of flow paths in which the flange 2b including the elastic member 2e and the connection member 13 are communicated with each other are used as the second flow path 202. On the other hand, the third flow path 203 is linear and has a flow path shape that changes direction and goes obliquely with respect to the axial direction.

  The measurement space 205 intersects and branches from the third flow path 203 and is provided in the axial direction of the pressure air measurement unit 4. The pressure sensors 5 are disposed in the measurement space 205, respectively. Is obtained by calculating the pressure value and flow rate value of the pressure air in the control circuit board 9 to be described later.

  The fourth flow path 204 is connected to the third flow path 203, further extends in the direction of the extension of the third flow path 203, and is provided to open to the outside in a straight line shape. Therefore, the third flow path 203 and the fourth flow path 204 are linearly arranged in series.

  The pressure sensor 5 is inserted into a measurement space 205 provided in the pressure air measurement unit 4 together with a sealing material (not shown), and measures the pressure in this space. In this embodiment, an analog atmospheric pressure sensor manufactured by Metrodyne Microsystem is used. Since the pressure air measurement unit 4 has eight air flow paths, a total of eight pressure sensors 5 are provided for each path.

  The wiring board 6 is a board for performing input / output wiring of the eight pressure sensors 5, and is individually fixed inside the pressure air measuring unit 4. A pressure sensor 5 is mounted on this board, and a power supply for driving the pressure sensor 5 and an electric wiring for an output voltage of pressure detection are made. The pressure sensor 5 is connected to a later-described control circuit board 9 by a connector and a cable (not shown). ing. Moreover, the wiring board 6 may be a flexible wiring board affixed on a rigid base material, and the connection wiring part with the control circuit board 9 may be constituted by an extension part of this flexible wiring board.

  The power source 7 supplies power to the pressure sensor 5 and the control circuit board 9 by means of electrical connection such as an unillustrated electric wire cable or conductive metal plate. In the present embodiment, a rechargeable secondary battery is used, which is a nickel metal hydride battery. The type of the power source 7 is appropriately selected in consideration of the power consumption of the pressure sensor 5 and the control circuit board 9 and the continuous use time required for the pressure air measuring device 1.

  The control circuit board 9 supplies electric power for driving to the pressure sensor 5, receives the voltage output obtained by the pressure sensor 5, calculates the pressure value of the pressure air and the flow rate value based on this, Is used to generate measurement value information of the pressure air state, A / D-convert this signal, and transmit it to the outside wirelessly. A signal transmitted wirelessly is received and demodulated by a dedicated receiver, a personal computer having a receiver, a machine tool having a receiver, or a personal computer having a receiver connected to a machine tool, and a measured value. Is stored in the data. Therefore, with such a configuration, it is possible to set a threshold value for the measured value in advance, and to make a warning sound or stop the machine tool if the measured value is below the threshold value. Furthermore, the voltage and impedance of the power supply 7 are sampled at a predetermined time interval to monitor the remaining amount of the power supply 7, and when the remaining amount of the power supply 7 falls below a predetermined value, a warning signal indicating insufficient remaining power is wirelessly transmitted. It also has a function for prompting charging.

  FIG. 3 is a perspective configuration diagram of the first embodiment of the machine tool system using the pressure air measuring device of the present invention. The pressure air measuring device 1 is mounted on the main shaft 100 in the machining area of the machine tool 500 and wirelessly transmits measurement value information of pressure air for cleaning blown from the main shaft 100. The personal computer 503 has receiving means for receiving pressure air measurement value information, a judgment means for judging whether or not to stop the machine tool from the received pressure air measurement value information, and a machine tool by this judgment means. Command means for instructing the control unit 502 of the machine 500 to stop.

  Similarly, the personal computer 503 also receives the remaining amount information of the power supply 7 and determines whether or not to stop the machine tool, and a command for instructing the control unit 502 of the machine tool 500 to stop using this determination means. Have means. Further, a warning can be displayed on the screen of the personal computer 503, and a warning sound can be emitted. The control unit 502 of the machine tool 500 can receive and execute a machine tool stop command from the personal computer 503, and can also issue a warning with the operation screen 501 or a warning sound.

  Further, as a modification of the present embodiment, what functions as the personal computer 503 may be incorporated in the control unit 502. Accordingly, the control unit 502 of the machine tool 500 directly receives the measurement value information of the pressure air of the main spindle 100 and the remaining amount information of the power source 7 from the pressure air measuring device 1 and determines the stop of the machine tool 500. Can be issued, and a warning can be issued by the operation screen 501 or a warning sound.

  According to the present invention, the environment in which the pressure air measuring device 1 is used is a mist of coolant or workpiece chips generated during processing, and burrs are generated on the mounting surface 102 of the spindle 100. Or may be scratched and dented. Even in this situation, the flange end 2c of the pressure air measuring device 1 that contacts the mounting surface 102 of the main shaft 100 is configured by the elastic member 2e, and the elastic member 2e is deformed to absorb burrs and dents. It is possible to measure the pressure air state without being affected. Further, since the elastic member 2e can be easily replaced, even if damage such as scratching occurs on the elastic member 2e, it can be immediately replaced and remeasured.

  Furthermore, since the machine tool system according to the present invention can prevent air leakage between the spindle and the pressure air measuring device, it is possible to reduce false detection of pressure air measurement and shorten maintenance time, so that the loss other than the time required for machining is reduced. Time can be reduced.

  As an application example of the present invention, it can be applied as a maintenance tool of a machine tool such as a machining center.

DESCRIPTION OF SYMBOLS 1 Pressure air measuring device 2 Holder part 2a Tapered shank 2b Flange 2c Flange end 2d Flange end surface 2e Elastic member 3 Cover case 4 Pressure air measuring part 5 Pressure sensor 6 Wiring board 7 Power supply 8 O-ring 9 Control circuit board 10 Screw 13 Connection member 41 Pressure air measurement unit 42 Cylinder 43 Piston 100 Main shaft 101 First flow channel 102 Mounting surface 202 Second flow channel 203 Third flow channel 204 Fourth flow channel 205 Measurement space 500 Machine tool 501 Operation screen 502 Control unit 503 Personal computer 504 Machine tool system

Claims (3)

In a pressure air measurement device that measures a state of pressure air blown from a first flow path provided on a spindle of a machine tool to a detachable portion of a machining tool that can be attached to and detached from the spindle, the pressure air measurement device includes:
A holder portion having a flange end detachably contacting the main shaft and a second flow path connected to the first flow path;
A pressure air measuring unit provided with means for measuring at least one of the pressure and the flow rate of the pressure air connected to the holder unit;
Have
The pressure air measuring device, wherein the flange end is formed of an exchangeable elastic member that forms a part of the second flow path.   2. The pressure air measuring device according to claim 1, wherein all or part of the elastic member is made of any one of nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, silicone rubber, and chloroprene rubber. A machine tool provided with a first flow path in the spindle for blowing pressure air to the attaching / detaching portion of the machining tool when the machining tool detachable from the spindle is attached to and detached from the spindle;
The pressure air measurement device according to any one of claims 1 to 2, which is attached to the main shaft;
A machine tool system characterized by comprising: