JPH0453657B2 - - Google Patents

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 the tool tool relative to a workpiece when turning is performed using a lathe.

``Conventional technology'' Conventionally, when turning with a lathe, center height adjustment to match the height of the cutting edge of the tip of the cutting tool with respect to the workpiece is done by predetermining the center height of the main axis of the workpiece. It was common for the cutting tool to be raised and lowered so that its cutting edge was approximately at the same height as the object to be turned.

"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 machining workpieces that require high precision, When turning the end face of an object, there is a residual machining in the center, a so-called navel, which becomes a major cause of defects when mirror finishing or the like is to be done. When using a CBN tool or a diamond tool for ultra-precision machining when turning high-hardness materials, if the center height is not adjusted accurately, the cutting edge of the chip may turn at an unexpected position. There was a problem in that the high price not only shortened the life of the knife but also caused a deterioration of the finished surface.

The present invention has been made by focusing on these conventional problems, and provides a cutting tool center height adjustment device that solves the above problems by making it possible to easily and reliably adjust the center height of the cutting tool. It is intended to.

"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 the contact obtained by forming the contact upward or downward; a detection sensor that sends a detection signal when the cutting edge of the cutting tool comes into contact with the detection slope or the reference plane; and an origin point based on the signal of the detection sensor. a coordinate value setting means for determining the coordinate value from the reference plane or origin to the detection slope; and based on the coordinate value of the coordinate value setting means, the center height of the cutting tool is determined from the difference between the reference plane and the detection slope and the inclination angle. The present invention resides in a cutting tool center height adjusting device comprising calculation means for calculating the value.

``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,
The difference in the abutting position caused by the angle of the detection slope, which appears as an amount corresponding to the vertical deviation of the cutting edge, is detected as the amount of deviation from the reference position, and the adjusting screw is operated according to the scale of the rotation index. By moving the moving table and changing the height of the cutting tool, the center height of the cutting tool can be adjusted.

“Embodiment” An embodiment of the present invention will be described below based on the drawings.

The figure shows an embodiment of the present invention, and as shown in FIGS. 1 and 2, the center height adjustment device 10 includes:
A detection unit 20 is positioned and held at the height of the spindle center Cl of the workpiece W, and a cutting tool holder 40 is movable in the spindle axis direction and in the vertical direction across the spindle axis in order to process the workpiece W. Consists of.

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 during machining, moves to a position where it does not interfere with the machining of the workpiece W, and when adjusting the center height. It is set so that the object W to be turned is positioned and held at the height at which it is to be mounted or on the center line of the spindle.

A contact detection sensor is installed inside the detection unit 20,
Contacts 30, 3 to be detected by this contact detection sensor
0... are attached so as to protrude from the four sides of the main body of the detection part 20, and are configured to be compatible with various types of bites.
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, a reference plane 32 is formed at the center of the tip of the contactor 30 and is perpendicular to the rotation center B of the object to be turned. On both sides of the reference plane 32, downwardly inclined detection slopes 33 are formed. , 34 are formed.
The inclination angle θ of the detection slopes 33 and 34 is based on the reference plane 32.
It is set so that it forms an angle of about 30 to 60 degrees with respect to the ground.

The reason why the plurality of detection slopes 33 and 34 are provided is that, as shown in FIGS. 2 and 6, there is a right-hand tool C and a left-hand tool C1, which has a different direction. This is because when the cutting edge is brought into contact with the contactor 30 in the case where the cutting tool is attached, it is possible to deal with any cutting tool whose direction is different.

As shown in FIG. 3, in this embodiment, the horizontal center line a at the center of the detection slope 33 (shown as a point in the figure) and the reference plane 32 are aligned in the Z direction, and the detection slope 33 is The inclination is set at approximately 30 degrees with respect to the reference plane 32. Therefore, for the distance Z0 between the machining origin O of the cutting tool and the reference plane 32,
If the position where the cutting edge of the cutting tool actually contacts the detection slope 33 is point b, and the distance from the machining origin O at that time is the distance Z1, then the difference Z1 - Z0 = L is tan60°
The value obtained by multiplying by the value h is the deviation amount h of the center height.

As shown in FIGS. 1 and 2, a plurality of tool holding stands 40 are provided facing the workpiece W to be turned, and each tool holding stand 40 is mounted in the X direction on a movable base 41 that can control the movement position in the Z direction. A base 42 is movably supported, a storage section 44 having an inclined bottom surface 43 is formed in the base 42, and a movable table 45 is stored in the storage section 44.

Each moving table 45 has a fixing screw 4 with a bite C and C1.
6, 46, and 46, and the movable base 45 is pressed and fixed together with the movable base 45 against the housing portion 44 using setscrews 45a, 45a, and 45a.

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 between the washer 47b and the retaining ring 4.
7c, it is held rotatable relative to the support piece 47a but immovable in the Z direction. The male threaded portion 48a of the adjustment screw 48 is inserted into the threaded hole 45 of the moving table 45.
It is screwed onto b.

The knob head 48b of the adjusting screw 48 has a scale 48c indicating the amount of height movement corresponding to the deviation amount h of the center height.
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, which is controlled by the CPU 50 and has a display tube.
The DRT and keyboard KB form a manual input system, and the pulse generator 51 that generates pulses to move the tool holding table 40 in the Z direction is connected to the CPU via I/0.
50, the inclination angle θ register of the contactor 30 is also connected to the CPU 50, and the detection unit 20 is also connected to the CPU 2.
Connected to 0.

An interpolation position control circuit 52 that receives pulse signals from a pulse generator 51 is provided, and the interpolation position control circuit 52 controls the tool holding table 40 through an amplifier 53.
It is connected to a motor 54 that moves it in the direction.

Distance Z0 is stored in the Z0 register.

When the distance Z1 is measured, the amount of deviation h is calculated as h = Ltan (90° - θ) through the calculation of Z1 - Z0 = L, and the amount of rotation of the adjustment screw 48 can be set accordingly. It is.

Next, the effect will be explained. Since the operation is the same in both bytes C and C1, 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, the rotary arm 21 is rotated to position and hold the detection unit 20 at the height at which the object W to be turned is to be mounted. The contactor 30 and the cutting edge of the cutting tool C are roughly adjusted so that their center heights match as much as possible, and then the adjustment begins.

First, the tool C and the tool holder 40 are moved in the Z direction to bring the cutting edge of the tool C into contact with the reference plane 32 of the contactor 30. That is, the pulse generator 5
The motor 54 is driven by the generated pulse 1, 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 makes contact and the contact detection sensor is activated, the distance Z0 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 point b,
Its position is measured as distance Z1 from the machining origin O, Z0-Z1=L is calculated, and h=Ltan
(90°−θ) is calculated.

As a result, the amount of displacement in the height direction of the cutting edge of the tool C is known, so loosen the set screw 45a while keeping the fixing screw 46 fastened, and rotate the adjusting screw 48 by the scale of the index 47d corresponding to the amount of displacement. If so, the movable table 45 will move, the height will change according to the inclined bottom surface 43, and if it is stopped at the position where the error in center height becomes 0, then tighten the setscrew 45a, and the tool C will be moved.
is fixed and can be fixed to the base 42.

The adjustment is completed above, so if you rotate the rotary arm 21 to release the detection unit 20 to a position that does not interfere with machining the workpiece w and stop it, you can attach the workpiece and perform accurate machining. 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 adjustment device according to the present invention, it is possible to easily determine the amount of center height deviation by simply pressing the cutting edge of the tool tool, thereby adjusting the amount of movement of the tool holder. 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 drawings 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, and Figs. 3 to 5 are contacts. Fig. 3 is a side view, Fig. 4 is a view taken in the direction of the arrow in Fig. 3, Fig. 5 is a perspective view, Fig. 6 is a plan view of the vicinity of the detection section, and Fig. 7 is a control system diagram. . A... Headstock of the lathe, B... Center of rotation (of the object to be turned), C, C1... Bit, W... The object to be turned,
10... 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 table, 48... Adjustment screw, 48c... Scale.

Claims (1)

[Scope of Claims] 1. 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 tool being formed on the contact to adjust the center line of rotation of the turning object or a reference plane of the contactor perpendicular to the processing direction of the cutting tool; a detection slope of the contactor obtained by turning the reference plane of the contactor in the processing direction of the cutting tool and forming the reference plane upwardly or downwardly; A detection sensor that sends out a detection signal when the cutting edge of the cutting tool comes into contact with the detection slope or the reference plane, and a coordinate value setting that calculates the coordinate value 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.