JPH06170627A - Tool edge position measuring device for boring machine - Google Patents

Abstract

PURPOSE:To measure the amount of projection of an edge highly accurately by moving a measurement device in the separating direction relative to a chip holder by an arm supported pivotally on a housing and measuring a moving force of a movable contactor touched on the edge of a chip to a measurement head. CONSTITUTION:When the amount of projection of a chip edge is adjusted after a chip 21 has been replaced first a machining diameter compensation motor is driven to return an eccentric compensation shaft 15 back to an eccentric original position, and then a spindle motor 13 is driven to face a measurement reference surface 22 of a chip holder 20 toward the left. Next an arm 27 is swung downward by the operation of a cylinder 30 to make a fixed contactor 39 of a measurement device 35 in contact with the measurement reference surface 22 and also a movable contactor 40 in contact with a chip edge 21a at the bottom end of the chip holder 20. In this case, a signal from an electric measurement section 42 is input into a chip measurement section, the amount of projection of the edge is measured comparatively with a zero-set master, and the measured value is compared with the set value for calculation of a compensation value. Then a machining diameter compensation motor is driven controllably to compensate the amount of projection of the edge 21a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring machine, and more particularly to a cutting edge position measuring device for a boring machine which measures the amount of protrusion of the cutting edge of a chip mounted on a chip holder immediately after replacement.

[0002]

2. Description of the Related Art As a conventional technique, there is one shown in FIG. In FIG. 6, reference numeral 1 is a chip holder removed from a boring machine (not shown), and the left end portion 1a
The chip 2 is detachably attached to the outer peripheral portion of the (lower end portion).
The tip 2 of the tip 2 is attached so that the cutting edge 2a thereof projects radially outward from the outer periphery of the tip holder 1. The tip holder 1 is detachably attached to an eccentricity correction shaft (not shown) which is eccentrically adjustable at its right end (upper end) and is connected to the main shaft of the boring machine. When measuring the amount of protrusion of the cutting edge 2a of the tip 2, the tip holder 1 is removed from the eccentricity correction shaft and attached to a predetermined jig (not shown) as shown in FIG. By placing the magnet rider gauge 4 with the dial gauge 3 attached to the side, contacting the probe 3a of the dial gauge 3 with the cutting edge 2a of the tip 2 and reading the scale indicated by the pointer 3b, The amount of protrusion of the cutting edge 2a is measured, and the amount of protrusion of the tip is adjusted to a specified outer diameter of the cutting edge. Next, the chip holder 1 is attached to the eccentricity correction shaft, and after eccentricity correction to a predetermined machining diameter, boring is performed, the machined work is measured, and based on the measurement result, the chip holder 1 with respect to the rotation axis of the spindle is The eccentricity is adjusted to set the machining radius of the workpiece to be machined next to a predetermined value.

In the above-mentioned conventional apparatus, when measuring the amount of protrusion of the cutting edge 2a of the tip 2, the tip holder 1 is detached from the boring machine and the measurement is performed. Therefore, this measurement requires time and skill. was there. In particular, when processing a work in which the wear of the chip 2 is severe, the above-mentioned measurement frequency increases, and there is a drawback that productivity decreases. Moreover, since the first work is machined based on the measurement adjustment result of the blade outer diameter by the magnet rider gauge 4,
The measurement error of the worker leads to the loss of expensive work, and there is a drawback that the worker's labor is lost. It is an object of the present invention to obtain a novel blade edge position measuring device for a boring machine that solves the above drawbacks.

[0004]

In order to achieve the above object, the present invention is configured as follows. That is, the tip is attached to the tip of the tip holder attached to the main shaft of the boring machine so that the tip can be detachably attached, and the tip of the tip is projected radially outward from the tip holder so that the tip of the tip of the tip protrudes. Has a measurement reference surface formed on the outer peripheral surface thereof, is swingably connected to a housing supporting a main shaft, and has an arm whose swing end moves in a direction toward and away from the measurement reference surface. A measuring device is provided at the moving end, and the measuring device uses the first spring to set the measuring reference surface in a state where the zero reference master is easily set in advance and the swinging end of the arm is close to the measuring reference surface. A measurement head that is urged to move in a certain direction, a fixed contact that is fixed to the measurement head and contacts the measurement reference surface, and that is slidably supported by the measurement head and that is more resilient than the first spring. Small and second movable contactor to be energized moving the cutting edge direction of the chip by the spring of, is obtained by a configuration having an electric measuring unit for converting the moving amount of the movable contact into electrical signals.

Further, a machining diameter correcting device for adjusting the turning radius of the cutting edge of the tip is provided, and a control device for driving and controlling the machining diameter correcting device in response to a signal from the electrical measuring section is provided.

[0006]

Since the present invention is configured as described above, the spindle is rotationally positioned on the measurement reference plane of the tip holder and the side where the tip faces the measuring device, and in this state, the tip of the arm is the tip of the spindle. When it is swung in the direction of approaching, the fixed contact of the measuring device contacts the measurement reference surface of the chip holder, the first spring is compressed, and the measuring head is held at a predetermined distance from the tip of the chip holder. To be done. At the same time, the movable contactor comes into contact with the cutting edge of the tip, the second spring is compressed, and the movable contactor moves in the retraction direction with respect to the measuring head. Then, the amount of movement of the movable contactor with respect to the measuring head is measured by the electrical measuring unit. Further, the control device inputs the electric signal of the electric measuring unit to drive and control the machining diameter correction device, and the tip turning radius of the tip is adjusted to a predetermined value.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a side view of a boring head portion of a multi-axis boring machine showing an embodiment of the present invention, FIG. 2 is a side view of a main portion showing a cutting edge position measurement state of a chip, and FIG. 3 is a cross section of a measuring device portion. FIG. 4 is a cross-sectional view of an essential part of the arm drive unit, and FIG. 5 is a block diagram of a control device for controlling the machining diameter correction device. In FIG. 1, 5 is a column of a boring machine, and a boring head 10 is attached to the column 5 via a saddle 6 which is vertically driven by a Z-axis motor (not shown).

The boring head 10 comprises a known eccentric boring head, and a main shaft (outer spindle) 12 is attached to a housing 11 fixed to a saddle 6.
Is rotatably supported, the spindle 12 is driven by a spindle motor 13, and a chip holder 20 is attached to the spindle 12 via a machining diameter correcting device 14. The processing diameter correction device 14 is
An eccentricity correction shaft (inner spindle) 15 is inserted into an eccentric hole formed in the main shaft 12, and the eccentricity correction shaft 15 is relatively rotated with respect to the main shaft 12 by a machining diameter correction motor 16 (servo motor) attached to a saddle 6. As a result, the tip holder 20 attached to the lower end of the eccentricity correction shaft 15 is attached to the main shaft 12
The amount of eccentricity is adjusted within a predetermined range with respect to the rotation axis center of.

As shown in FIGS. 2 and 3, the tip holder 20 has an upper end portion connected to the lower end of the eccentricity correction shaft 15 and a tip 21 detachably attached to the lower end portion (tip portion). The tip 21 has its cutting edge 21a projected outward in the radial direction. In addition, a smooth measurement reference surface 22 is formed on the outer peripheral portion of the tip holder 20 which is located on the side where the cutting edge 21a projects and which is located immediately above the tip 21.

As shown in FIGS. 1 and 2, a supporting member 25 is fixed to the housing 11 by projecting it to the left, and an arm 27 is attached to the lower portion of the supporting member 25 as a fulcrum pin 26.
It is mounted so that it can be swung in the vertical direction via. As shown in FIG. 4, a pinion 28 is fixed to the fulcrum pin 26,
The pinion 28 is engaged with a rack 29 that is movable in the X (left and right) direction within the support member 25, and the rack 29 is connected to a rod 30a of a hydraulic cylinder 30 attached to the right portion of the support member 25. As a result, the rack 30 is moved in the left-right direction by the cylinder 30, the pinion 28 is rotated in the left-right direction, and the arm 27 is swung downward and leftward about the fulcrum pin 26. When the arm 27 swings downward, its swinging end (lower portion) approaches the left surface of the lower portion of the chip holder 20.

A measuring device 35 is attached to the swing end of the arm 27.
Install. This measuring device 35, as shown in FIG.
The bracket 3 fixed to the lower end of the arm 27 in a state where the swing end of the arm 27 approaches the measurement reference plane 22.
6, a measurement head 37 is slidably attached to the left and right, and the measurement head 37 is attached to the chip holder 2 by a first spring 38.
0, that is, the movement is biased toward the measurement reference plane 22. This first
The spring 38 is for reliably bringing the measurement heads 37 of the respective measuring devices 35 into contact with the measurement reference surfaces 22 of the plurality of chip holders 20 in the multi-axis boring machine. The fixed contact 39 is fixed to the upper portion of the measurement head 37 by protruding rightward, and the right end thereof is brought into contact with the measurement reference surface 22.
Further, the movable contact 40 is slidably fitted to the lower portion of the measuring head 37, and the movable contact 40 is urged toward the right by a second spring 41 having a smaller elastic force than the first spring 38. Then, the right end thereof is brought into contact with the cutting edge 21a of the tip 21,
On the left surface of the movable contact 40, a probe 42a of an electric measuring unit 42 including an electric micrometer is elastically contacted. In FIG. 2, reference numerals 31 and 32 are stopper pins that determine the lower swing limit and the upper swing limit of the arm 27. Further, in FIG. 3, reference numeral 43 denotes an air blow port for ejecting compressed air toward the measurement reference surface 22 of the chip holder 20 and the cutting edge of the chip 21, which prevents a measurement error due to biting of chips.

In FIG. 1, reference numeral 45 is a control device for controlling the spindle motor 13, the machining diameter correction motor 16, the cylinder 30, etc., and is as shown in FIG. That is, when the measurement switch (not shown) is turned on by the operator after replacing the tip 21, the return instruction is issued from the measurement instruction means 46 to the tip holder origin return means 47, and the tip holder origin return means 47 is issued. Eccentricity correction shaft (inner spindle) 15 by controlling the machining diameter correction motor 16
Is returned to the eccentric original position, and the spindle motor 13 is driven and controlled so that the measurement reference surface 22 of the chip holder 20 is directed to the left in FIG. Next, the cylinder 30 is driven and controlled by the measuring device positioning means 48 to swing the arm 27 downward so that the fixed contact 39 of the measuring device 35 is on the measurement reference plane 22 and the movable contact 40 is the cutting edge 2 of the tip 21.
1a is brought into contact with each other. Immediately before these contacts, compressed air is jetted from the air blow port 43 to clean the measurement reference surface 22 and the cutting edge 21a. Next, the tip measuring means 49 inputs a signal from the electric measuring section 42 to measure the protrusion amount of the cutting edge 21a of the tip 21 in comparison with the zero set master, and the comparison calculating means 50 compares the measured value with the preset machining diameter setting means. The correction value is calculated by comparing with the set value of 51. Then, the machining diameter correcting means 52 drives and controls the machining diameter correcting motor 16 based on the above correction value to rotate the eccentricity correcting shaft 15 relative to the main shaft 12 by a predetermined angle so that the machining diameter by the cutting edge 21a of the replaced tip 21 is changed. Correct to the standard value.

[0013]

As is apparent from the above description, according to the present invention, the measuring device is moved in the contacting / separating direction with respect to the chip holder by the arm swingably connected to the housing,
When the measuring device approaches the tip holder, the fixed contact is brought into contact with the measurement reference surface of the tip holder to position the measuring head with respect to the tip holder, and in this state the movable contact is brought into contact with the tip of the tip, Since the amount of movement of the movable contactor with respect to the measuring head is measured by the electric measuring unit, the amount of protrusion of the tip of the tip can be measured quickly and highly accurately. In addition, since the machining diameter correction device is driven and controlled by the signal of the electric measuring unit, it is possible to machine a passable work from the machined work immediately after the chip replacement, and it is possible to significantly reduce the time required for machining preparation. Produce an effect.

[Brief description of drawings]

FIG. 1 is a side view of a boring head portion of a boring machine showing an embodiment of the present invention.

FIG. 2 is a side view of essential parts showing a state of measuring the tip position of a tip.

FIG. 3 is a cross-sectional view of a measuring device unit.

FIG. 4 is a cross-sectional view of a main part of an arm driving unit.

FIG. 5 is a block diagram of a control device that controls the processing diameter correction device.

FIG. 6 is a side view of a main portion of a conventional tip in a state of measuring a blade edge position.

[Explanation of symbols]

 5 Column 6 Saddle 10 Boring Head 11 Housing 12 Spindle (Outer Spindle) 13 Spindle Motor 14 Machining Diameter Correction Device 15 Eccentricity Correction Shaft (Inner Spindle) 16 Machining Diameter Correction Motor 20 Tip Holder 21 Tip 21a Cutting Edge 22 Measurement Reference Surface 25 Supporting Member 26 fulcrum pin 27 arm 28 pinion 29 rack 30 cylinder 30a rod 31 stopper pin 32 stopper pin 35 measuring device 36 bracket 37 measuring head 38 first spring 39 fixed contactor 40 movable contactor 41 second spring 42 electric measuring part 42a measuring element 43 Air Blow Port 45 Control Device 46 Measurement Command Means 47 Chip Holder Origin Returning Means 48 Measuring Device Positioning Means 49 Chip Measuring Means 50 Comparative Calculation Means 51 Machining Diameter Setting Means 52 Machining Diameter Correcting Means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Ken Ito Ichibanchi, Niihama-cho, Kanda-cho, Kyoto-gun, Fukuoka Prefecture Nissan Motor Co., Ltd. Kyushu factory

Claims (2)

[Claims] 1. A side on which a tip of a tip holder mounted on a spindle of a boring machine is detachably provided, and a blade edge of the tip is projected radially outward from the tip holder so that the tip of the tip projects. Forming a measurement reference surface on the outer peripheral surface of the tip holder, and providing an arm swingably connected to a housing supporting a main shaft and having an oscillating end portion moving in a contact direction with respect to the measurement reference surface. A measuring device is provided at the swinging end of the arm, and the measuring device is configured such that the swinging end of the arm approaches the measurement reference plane.
A measurement head that is urged to move toward the measurement reference plane by a first spring, a fixed contact that is fixed to the measurement head and contacts the measurement reference plane, and slidably supported by the measurement head. A movable contact that is urged to move in the blade tip direction of the chip by a second spring having a smaller elastic force than the spring, and an electric measurement unit that converts the amount of movement of the movable contact into an electric signal. Blade edge position measuring device for boring machines. 2. A machining diameter correcting device for adjusting a turning radius of a cutting edge of the tip is provided, and a control device for driving and controlling the machining diameter correcting device according to a signal of the electrical measuring unit is provided. Cutting edge position measuring device for the boring machine described.