JPS59232748A - Grinding speed controller in machining center - Google Patents

Abstract

PURPOSE:To enable smooth working similarly with other tool, when using a grinder while assembling in machining center, by detecting the rotary speed of grinder and controlling the feeding speed of work in accordance with the load. CONSTITUTION:A rotation detecting gear 20 having many small teeth is secured to a coupling 15 between the motor shaft 3'' of a vertical shaft air grinder 1 and a grinding wheel fixing spindle 8 while an electromagnetic sensor 21 fixed to the splindle supporting casing 6 is provided near to the gear 20 to couple the sensor 21 electromagnetically at the outside of casing 6 with a controller through electromagnetic couplers 22, 23. Pulse signals are provided in parallel from the sensor 21 to the controller through a rotation meter, a plurality of rotation setting switches and comparators. Furthermore, the controller and the control system are coupled such that the table feed speed is controlled selectively by the output signal from each comparator.

Description

[Detailed Description of the Invention] [Kihatsu] is a tool in a machining center that incorporates an air grinder into the spindle so that grinding or polishing work can be performed at the same time.
The present invention relates to a grinding speed control device for a grinder in a machining center, which detects the rotational speed of an air grinder used and controls the feed speed of a workpiece in accordance with the load to enable effective work.

In order to improve the productivity of machining and promote labor saving in factories such as unmanned operation, one machine tool automatically exchanges coolants according to the machining order according to a preset program and a series of Many machining centers have been adopted to accommodate workpieces during the machining process, allowing them to perform multiple machining processes without having to be changed.

Conventionally, this type of machine tool mainly uses a rotating cutting tool such as a price cutter, milling cutter, drill, etc., which is attached to and removed from a spindle to perform cutting using the cutting tool. Of course, most of the machining of workpieces involves high-speed machining by cutting, and almost all of the required machining set in advance by a program can now be performed simply by fixing the workpiece on a table. There is.

However, in order to further improve machining accuracy and save labor, it is desirable that not only cutting with a knife but also grinding and polishing be incorporated into the program and used in combination.

Therefore, we introduced an air grinder that can be used in the same way as a conventional cutting tool in a machining center.
With r+, we have already achieved the ability to perform grinding or abrasive processing with a machining center, but as is well known, air grinders (mainly targeted at hand-held air tools) accept pressurized air and rotate Wl! ! ! Since it uses an IJ air motor to rotate a grinding wheel to perform the desired work, if it is handled like a general rotary cutting tool for a machining center, it will not grind (or polish).
It is difficult to maintain the speed at the set value (when the load is large, the motor rotation speed decreases, and conversely, when the load is small, the motor rotates at high speed, making it impossible to maintain the machining state at a steady or desired state). It was found that it became impossible to carry out the work as planned, and that the program control became difficult.

SUMMARY OF THE INVENTION The present invention solves certain problems and provides an air grinder for a machining center that can be controlled under preset machining conditions so that required machining can be performed smoothly in the same manner as with other cutting tools.

In the present invention, the tool mounting provided on the main machine of the machining center is such that a pressurized air supply path for driving the grinder is formed in the center of the spindle, and when the tool is fitted into the tool mounting hole of the spindle, pressure air is supplied to the motor section. In a straight-shaft air grinder for machining centers that forms part of a holder designed to Then, an electromagnetic sensor fixed to the casing is installed close to the detection gear, and the signal from this electromagnetic sensor is introduced to the tachometer outside the casing by the machine side and the electromagnetic coupler, and from the tachometer to the calibrator. It is connected to a control mechanism so that the table feed speed of this machine is selectively controlled by the output signal from the machine.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. What is shown in FIG. Motor (3) inside
The outer circumferential chamber in the rear half is tapered to match and fit into a tapered hole formed in the spindle of this machine. For the motor (3) section, the base salary (2
An air supply connecting pipe (4) is housed at the rear end of the spindle, and is connected to the air supply piping line connected to the pressurized air supply source provided at the center of the spindle. ) A well-known governor type air supply valve (not shown) is installed in the air supply part to the air IFi 13'l, and a V-shaped annular groove (6') is provided on the intermediate outer periphery of the main body (2). A engraved tool exchange clamp mounting ring (5) is fitted and fixed.

In addition, there is a main shaft support casing (6) at the front of the main body (2).
are directly connected and tightened, and the internal bearing +71
171, the main shaft (8) is connected to the output shaft f of the motor (3).
The casing (6) has an exhaust passage 19 for the motor (3) built in the main body (2).
), and a porous exhaust cover ring 11 of an appropriate thickness is provided with a space and a communication FNItool, and is fitted and fixed on the outer periphery! The exhaust gas from the motor section iWJ is dissipated to the outside from the entire circumference. At the tip of the main shaft (8), a flexible grinding wheel (not limited to this) can be held and stored by clamping and fastening it with the metal (I-kun) and presser foot (I-kun). be.

Therefore, the connecting part between the motor output shaft (Y) on the main body (2) side and the main shaft (8) to which the grinder Jlfi is attached directly connects both shafts +g+ts+, as shown in Figures 2 and 3. Sleeve-shaped joint (connect by aligning the shaft cores in one joint,
A gear for detecting rotational speed is fitted and fixed in the space of the contact Wt on the side of the main shaft support casing (6) on the joint plate, and this gear for detecting rotational failure is made of a small module with multiple teeth. An electromagnetic sensor υ is provided so as to be fixed to the main shaft support casing (6) so that its tip is close to the gear steel for detecting rotational desire. This electromagnetic sensor (2υ is connected by a lead wire to the electromagnetic coupler supported by the support member fixed to the outer periphery of the spindle support gauge (6)), and is connected to the spindle iron of the machining center (g). For installation, an electromagnetic coupler (b) of the same structure is protruded at a predetermined position near the electromagnetic force puller (3), and the double force puller (a) (2) is in a non-contact state. It is designed to be preserved. A controller II (c) incorporating a tachometer and a comparison signal output device is installed at a suitable location on the tree root side.
This controller 12- includes a tachometer (to) that measures the number of rotations by inputting the pulsed current from the electromagnetic sensor, and a digital switch c271m a' for setting a plurality of number of rotations.
r+... (three in the embodiment) are connected in parallel with a comparator (c)-6...... interposed between them, and each rotation speed setting switch @ The set value by -^ and the detected value of the output side rotation speed of the grinder (1) are compared by each comparator, and the comparator with the higher value is sequentially transferred to the comparator with the lower value, and each output device 8j is An electrical control mechanism is associated so as to be applied to the root-side workpiece feed rate control mechanism for corresponding operation.

In addition, in order to ensure the connection from the load detection part (electromagnetic sensor H) of the grinder described above to the controller (c) installed on the tree root side using the electromagnetic coupler (5) (4), a clamp attachment ring (5) for tool exchange is provided. ) is attached with a protrusion to a part of the annular groove (6'), and when the tool change clamp is engaged in the annular groove (61), the position of the attachment to the grinder's root spindle 'JZ K is almost fixed. .

Alternatively, a positioning pin, 1η, is attached to the outer side of the main body (2) by a support member ill parallel to the axis of the main body (2).
=j is installed, and the spindle support boss on the machining center side
:+6 The position of the storage is determined by aligning the positioning pin 11 with the positioning hole of the position lα (positioning boss body i) provided on the end face (see Figure 1).

Furthermore, the electromagnetic coupler can be placed at any position around the spindle. The controller is equipped with a display unit that digitally displays the rotational speed detected by the electromagnetic sensor @0 to facilitate setting of the feed rate (see Fig. 4).

To explain the operating mode of the present invention, the air grinder f1) is used, for example, in a horizontal axis type machining center (g) as shown in FIG. Store it in the same position as the other various soles (preferably, as described above, when installing it to the spindle t32, store it in such a way that the electromagnetic coupler position matches the position), and store the sole ( A pressurized air supply hole is drilled in the direction of the central axis of the spindle (9), which is arranged sideways on one side of the workpiece support table 341 in front of the 3D,
Internally, the pressure air t from the factory airline etc. is connected via a rotary joint, and an electromagnetic on-off valve is interposed in the middle of the piping so that this valve opens only when the air grinder is in use. A control circuit that opens the valve to vent when the air grinder is installed in the spindle 0 by a control system operation mechanism combined with the tool exchange device 0, and closes the valve when exchanging with another tool. I will connect it with.

In this way, when machining a workpiece with a machining center, the machining is performed sequentially according to a preset program according to the required shape, processing location, and processing order, and the sole is replaced when grinding is required. by a well-known means and set the air grinder +11 to spindle 0.
When attached to the attachment part of the bottle, the on-off valve in the pressure air piping opens in conjunction with the replacement operation of this air grinder m, and after the attachment is completed, the air grinder main body (2) is connected to the air supply connection pipe (4).
The air motor rotates when pressurized air is supplied to the inner motor (i3), and the grinding wheel +1 rotates at high speed via the main shaft (8), which is directly connected to the main shaft (8) with a joint tilt, and is placed on the support table □□□. Collection 1
The required surface of the cut workpiece is ground.

When grinding is required during the machining process, due to the work tendency of the grinder, the controller attached to Kine C (11)
The setting switch an air 6 allows the table sound feed speed to be changed in multiple stages. Note that the setting transmission sheet for converting the feed rate can be set arbitrarily, so it is desirable to prepare data corresponding to X1 for the grinding conditions in advance and set it using this ◇Set the grinding conditions in this way. If the air grinder (1) is activated, the motor (3) and the grinding wheel V121 will be attached to the main shaft (8) by the rotation of the gear for detecting rotation failure, which is installed at the joint fixed to the main shaft (8).
A pulsed current is generated by the electromagnetic sensor υ and the gear - placed opposite each other, and ζ and rL are electromagnetically induced from the electromagnetic coupler i2z attached to the grinder (+) to the opposing electromagnetic coupler (to) attached to the main #01) side. Expand 1. f;, the pulsed current induced on the side of the magnetic coupler (■) is accepted as the tachometer input in the controller t51, and the count signal counted by this tachometer μs is sent to the rotation speed setting section which is provided with multiple changes. The first comparator (c) accepts and compares the set rotation speed and the operating rotation speed, and if the operating value is higher than or the same as the set value, the output is 0.
If it is low, a digital signal of 1 is sent to the table feed control mechanism on the machine side, and in the case of Si2, the load is within the set conditions, so work continues with the original feed, and in the latter case, the set conditions are Since this indicates that the table is overloaded, the drive control section of the feed mechanism is operated in the range up to overload detection in the rotation speed setting section of the next stage, and the table feeding speed is reduced. . Here, 艷e here's second
If the comparator υ9 of the stage is found to have a negative load (tlj) at this point as well, the drive control section of the feed mechanism changes to the feed speed of the second stage with that output signal. Thereafter, when the load increases in this way, the feed speed is decreased each time.Then, the grinder 11) is made! ! The number of revolutions that change from time to time depending on the number of rotations during the rotation) and the electromagnetic sensor button is counted, and this is set as the final value by the number of rotations setting section of the multi-purpose machine. When operating toward the overload φ1f side, reduce the feed speed of the workpiece-mounted cheagle to 1] "1", and if the negative load is low & then work in the opposite direction. The actual operation of the grinder is immediately detected electrically, and this can be used to control the feed speed of the workpiece on the 4-speed machine side, allowing efficient and rational FKI 74: Grinding work. This means that it can be incorporated and executed during machining work using a machining center.

As described above, according to the present invention, when the grinder is incorporated into a machining center and used, the change in rotation speed of the grinder Φ11 can be reduced by dividing the overload which was a problem when using an air motor as the drive source. ＜This is detected by a pulse signal, and the feed speed of the workpiece can be controlled externally using a feed speed setting unit that combines a digital tough 1/sinch and a comparator to prevent overload. This made purposeful built-in use practical.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a longitudinal cross-sectional view of an embodiment of an air grinder used for replacing materials in a machining center, and FIG. ! Section vertical t
f? FIG. 4 is a diagram showing a block diagram of the control mechanism, and FIG. 5 is a perspective view of an external furnace 1 of a 12-thinning center employing the device of the present invention. (1) Air grinder t21 °・main
Body 13)...Motor +il...Out
Force shaft (6)...Main shaft support casing (8)...
・Main shaft J21... Grinding wheel
Inclination...Connection (1<...Connection 111 (Idle rotation)...Rotation pusher H...Electromagnetic sensor 1...Electromagnetic coupler field...Controller
``A...Rotation total 1271 pzn a-・
・Switch for setting the rotation speed (to) a4 cz...
・Comparison machine side...machining center (30...this machine (b)
...Spindle (Foundation)...Support stake 0 waiting, rF release person Fuji Sorane Co., Ltd. Agent Masafumi Miki Paper-Seal-1

Claims (1)

[Claims] Tool mounting on a machining center is a straight-shaft air grinder used for devices that allow the air grinder to be used interchangeably with the spindle, and the motor shaft and grinding wheel are mounted using a rotating shaft with many small teeth engraved on the fluid ball connected to the main shaft. An electromagnetic sensor with a detection gear fixed to the casing capital is provided adjacent to the rotation failure detection gear, and the electromagnetic sensor is electromagnetically coupled to a controller attached to the tree root side outside the casing by an electromagnetic coupler. In the controller, the pulse signal from the electromagnetic sensor is received in parallel through a tachometer, a rotation speed setting switch, and a comparator. 1. A grinding speed control device for a grinder in a machining center, characterized in that the controller is connected to a Kine control system so that the feed speed can be selectively controlled.