JPS629852A - Device for adjusting core height of cutting tool - Google Patents

Abstract

PURPOSE:To adjust easily and securely the core height of a cutting tool by obtaining the core height of the cutting tool to obtain the difference and the slant angle between a reference plane and a detected slant surface from a detecting signal when the cutting edge of the cutting tool engages the detected slant surface or reference plane of a probe. CONSTITUTION:A detecting section 20 is held at a position to which a work W is attached. And first the cutting edge of a cutting tool C is applied to the reference plane 32 of a probe 30 to make a contact detecting sensor responsive and determine the reference position. Next, the cutting edge of the cutting tool is applied to a detecting slant surface 33 so that the difference between abutting positions caused by the angle theta of said surface 33 represented by an amount corresponding to the vertical deviation of the cutting edge is detected as the deviation amount from the reference position. And an adjusting screw 48 is operated according to the scale 48a of a rotary index to move a transfer bed 45 and change the height of the cutting tool so that the core height of the cutting tool C is adjusted. Thus, the deviation of core height of the cutting tool can be easily found to adjust securely the core height for high accuracy working.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a tool center height adjustment device for setting the position of a cutting tool relative to a workpiece when turning is performed using a lathe.

``Conventional technology'' Conventionally, when turning with a lathe, the center height adjustment to match the height of the cutting edge of the tool tip with respect to the workpiece is done by predetermining the center height of the main axis of the workpiece. Generally, the cutting tool was raised and lowered so that the cutting edge almost matched the height of the workpiece.

``Problems to be solved by the invention'' However, with this conventional method of center height adjustment,
There is not much of a problem when machining ordinary workpieces, but
For example, when turning the end face of a workpiece that requires high precision, there is a residual machining in the center, a so-called navel, which causes a major defect when producing a mirror-finished ring. C for turning high hardness materials
When using a BN-based cutting tool or a diamond cutting tool for ultra-precision machining, if the center heights are not matched accurately, the cutting edge of the tip may end up turning in an unexpected position, which will shorten the life of the expensive tool. There has been a problem in that not only is it reduced, but it can also lead to deterioration of the finished surface.

The present invention has been made by focusing on such conventional problems.
It is an object of the present invention to provide a center height adjusting device for a cutting tool which solves the above-mentioned problems by making it possible to easily and reliably adjust the center height of a cutting tool.

"Means for Solving the Problems" The gist of the present invention for achieving the above object is to adjust the center height of a cutting tool having a contact for setting the height of the tooling tool for machining a workpiece. A device comprising: a reference plane of the contact formed on the contact and perpendicular to the rotational center line of the workpiece or the machining direction of the cutting tool; A detection slope of a contact obtained by forming the contactor upwardly or downwardly, and a detection sensor that sends a detection signal when the cutting edge of a cutting tool comes into contact with the detection slope or the reference plane.

Coordinate value setting means for determining the coordinate value from the origin to the reference plane or from the origin to the detection slope based on the signal of the detection sensor; and the difference and inclination between the reference plane and the detection slope based on the coordinate values of the coordinate value setting means. The present invention resides in a tool center height adjustment device comprising a calculation means for determining the center height of the tool tool from an angle.

``Operation'' The detection part is held at the position where the object to be turned is to be mounted, and the cutting edge of the cutting tool is first applied to the reference plane of the contact to cause the contact detection sensor to react to determine the reference position, and then the detection Place the tip of the cutting tool on the slope, detect the difference in the abutting position caused by the angle of the detected slope as an amount corresponding to the vertical deviation of the blade tip as the amount of deviation from the reference position, and then tighten the adjustment screw. The center height of the cutting tool can be adjusted by operating according to the scale of the rotation indicator and changing the height of the cutting tool by moving the moving table.

"Example" An embodiment of the present invention will be described below based on one drawing.

The figures show one embodiment of the present invention, and FIGS.
As shown in the figure, the center height adjustment device 1o includes a detection section 2o that is positioned and held at the height of the spindle center C1 of the workpiece;
It consists of a tool holder 4o that is movable in the direction of the spindle axis and in the vertical direction crossing the spindle axis in order to machine the object W to be turned.

The detection unit 20 is held at the tip of a rotary arm 21 whose base end is connected to the headstock A of the lathe, and the detection unit 20 is held at the tip of a rotating arm 21 whose base end is connected to the headstock A of the lathe.
When adjusting the center height, the workpiece W to be turned is positioned and held at the height at which it is to be mounted or on the centerline of the spindle.

A contact detection sensor is installed inside the detection unit 20, and contacts 30°, 30, . has been done. As the contact detection sensor, for example, a high precision micro limit switch or a differential transformer is used.

The contactor 30 is mounted so that its base portion is biased in the protruding direction so as to be able to move forward and backward by a small amount with respect to the main body of the detection section 20 .

As shown in FIGS. 3 to 5, the tip of the contactor 30 has a reference plane 32 orthogonal to the center of rotation B of the object to be turned.
is formed, and detection slopes 33 slope downward on both sides thereof.
．． 34 is formed.

The inclination angle θ of the detection slopes 33 and 34 is set to form an angle of about 30 to 60 degrees with respect to the reference plane 32.

The multiple surfaces of the detection slopes 33 and 34 are provided because
As shown in Fig. 2 and Fig. 6, right-hand pie)C
This is to accommodate any of the cutting tools with different directions when applying the cutting edge to the contactor 30 in the case where a left-handed tool (C1) and a left-handed tool (C1 with a different direction) are installed.

As shown in FIG. 3, in this embodiment, the horizontal center line a (shown as a dot in the figure) at the center of the detection slope 33 and the reference plane 32 are aligned in the Z direction, and the detection slope 33
The inclination of is set at approximately 30 degrees with respect to the reference plane 32. Therefore, with respect to the distance @20 between the machining origin 0 of the cutting tool and the reference plane 32, the distance from the machining origin O at that time, assuming that the cutting edge of the cutting tool actually contacts the detection slope 33, is the distance @21. Then, the difference Zl-20-L is ta
The value multiplied by ngoo is the deviation measure of the center height.

As shown in FIGS. 1 and 2, the tool holder 40 is provided with multiple stages facing the workpiece W, and each tool holder 40
A base 42 is supported movably in the X direction on a movable base 41 whose movement position can be controlled in the Z direction, a storage section 44 having an inclined bottom surface 43 is formed in the base 42, and a movable base 45 is formed in the storage section 44. is stored.

Each moving table 45 has fixing screws 46.46 and 46.
．． 46, and the moving table 45 is fixed with set screws 45a, 45.
a, 45a are pressed together with the movable table 45 to the storage section 44 and fixed.

An adjustment screw 48 is inserted into an insertion hole drilled in a support piece 47a of a bracket 47 fixed to the base 42, and the adjustment screw 48 is inserted into the support piece 4 by a washer 47b and a retaining ring 47c.
Although it is rotatable relative to 7a, it is held immovable in the Z direction. The male threaded portion 48a of the adjustment screw 48 is connected to the moving base 45.
It is screwed into the screw hole 45b of.

The knob head 48b of the adjusting screw 48 is provided with a scale 48c indicating the amount of height movement corresponding to the center height deviation measurement, and the support piece 47a of the bracket 47 is provided with an index 47d corresponding to the scale 48c.

FIG. 7 is a control system diagram of the center height adjustment device 10.
The display tube CRT and the keyboard KB constitute a manual input system, and the pulse generator 51 that generates pulses to move the tool holding table 40 in the Z direction is controlled by the U50.
The inclination angle θ register of the contact 30 is also connected to the CPU 50, and the detection unit 20 is also connected to the CPU 20.

An interpolation position control circuit 52 is provided which receives pulse signals from the pulse generator 51, and the interpolation position control circuit 52 is connected to the amplifier 5.
3 to a motor 54 that moves the tool holding table 40 in the Z direction.

The distance aZO is stored in the ZO register.

When the distance Z1 is measured, the deviation amount is calculated as 'h = Ltan (90''-θ) through the calculation of Zl-20-L, and the amount of rotation of the adjustment screw 48 can be set thereby. It is.

Next, the effect will be explained. Since the operation is the same for both bytes c and ci, byte C will be explained as a representative.

During machining, the rotating arm 21 of the detection unit 20 rotates and escapes from the vicinity of the object W to be turned, so as not to interfere with the machining.

When adjusting the center height, rotate the rotating arm 21,
The detection unit 20 is positioned and held at a height at which the object W to be turned is to be mounted. Make a rough adjustment to match the center heights of the contact 30 and the cutting edge of the pie (C) as much as possible before starting the adjustment.

First, the cutting edge of the cutting tool C is brought into contact with the reference plane 32 of the contactor 30 by moving the cutting tool C and the cutting tool holder 40 in the Z direction. That is, the motor 54 is driven by the pulses generated by the pulse generator 51, and data is sent from the interpolation position control circuit 52 as the amount of movement in the Z direction from the origin O. When the blade edge comes into contact and the contact detection sensor is activated, the distance @20 is measured based on the amount of movement up to that point.

Next, the cutting edge of the cutting tool C is applied to the detection slope 33. If the center height is incorrect and the cutting edge hits the dot, its position is measured as the distance f@Zl from the machining origin 0, and ZO-21=L
is calculated, and furthermore, h = L tan(90°−θ
) is calculated.

As a result, the amount of displacement in the height direction of the cutting edge of pi
If the adjustment screw 48 is rotated by the scale of the index 47d corresponding to the amount of displacement, the movable table 45 will move and the height will change according to the inclined bottom surface 43, and at the position where the center height error becomes O. If the set screw 45a is tightened after stopping, the pi) C is fixed and can be fixed to the base 42.

The adjustment is completed above, so if the rotating arm 21 is rotated to release the detection unit 20 to a position that does not interfere with machining of the workpiece W and then stopped, the workpiece can be mounted and accurate machining can be carried out. can start.

It goes without saying that the detection slopes 33 and 34 may be inclined either upward or downward depending on the direction (vertical direction) of the cutting edge of the cutting tool.

"Effects of the Invention" According to the tool center height adjusting device according to the present invention, it is possible to easily know the amount of center height deviation by simply pressing the cutting edge of the tool tool, and thereby the moving base of the tool tool holding base can be adjusted. By raising and lowering it, you can reliably match the center height of the cutting tool and perform highly accurate machining.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a partially cutaway front view of the center height adjustment device, Fig. 2 is a plan view,
Fig. 3 to Fig. 5 show the contactor, Fig. 3 is a side view, Fig. 4 is a view from the arrow in Fig. 3, Fig. 5 is a perspective view, and Fig. 6 is a plane near the detection part. 7 are control system diagrams. A... Headstock of the lathe B... Center of rotation (of the object to be turned) c, ci... Tool W... The object to be turned io.
...Center height adjustment device 20...Detection unit 30...Contactor 32...Reference plane 33.34...Detection slope 40...Bite holding stand 42...Base
43... Inclined bottom surface 45... Moving platform 4
8... Adjustment screw 48c... Scale

Claims (1)

[Scope of Claims] A center height adjustment device for a cutting tool having a contact for setting the height of a cutting tool for machining a turning object, the center height adjusting device having a contact for setting the height of a cutting tool for machining a turning object, the tool being formed on the contact to adjust the center line of rotation of the turning object or the cutting tool. a reference plane of the contact that is orthogonal to the processing direction of the contact; a detection slope of the contact obtained by rotating the reference plane of the contact in the processing direction of the cutting tool and forming the reference plane upward or downward; a detection sensor that sends a detection signal when the cutting edge of the cutting tool comes into contact with the slope or the reference plane; and a coordinate value setting means for determining coordinate values from the origin to the reference plane or from the origin to the detection slope using the signal from the detection sensor. and a calculation means for determining the center height of the cutting tool from the difference between the reference plane and the detected slope and the inclination angle based on the coordinate values of the coordinate value setting means.