JPH0561511A - Phase matching method for work hole position of lathe - Google Patents

Abstract

PURPOSE:To correct the error of a rotational phase even when a work which is applied to a biaxial turret lathe with a loader and undergone the hole machining at an eccentric position is reloaded to another spindle. CONSTITUTION:The touch sensor 20 of a turret 5 is inserted into the pierced hole Wa of a work W held by a spindle chuck 14 up to a position C set by a program. A spindle 4 is revolved forward and reversely until the inside surface of the hole Wa comes into contact with the sensor 20. Then the revolving direction coordinate value of the spindle 4 is detected when a contact is secured between the inside surface of the hole Wa and the sensor 20. Then the revolving direction coordinate value is calculated for the center position of the hole Wa based on the detected coordinate value. This calculated coordinate value is compared with the position of an original point, and the rotational phase of the spindle 4 is corrected by an amount equal to the difference obtained from the comparison.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work hole position / phase aligning method for a lathe applied to a two-axis turret lathe equipped with a loader.

[0002]

2. Description of the Related Art In a twin-screw lathe with a loader, a work having a through-hole machined in a spindle in a first step is remounted on a spindle in a second step by a loader, and the through-hole is tapped or Various processing may be performed based on.

[0003]

However, when the work is transferred between the two spindles by the loader, the rotation phase of the work may be shifted and the position of the through hole may be displaced. As a result, there is a problem that the processing accuracy is lowered and the processing cannot be performed in the second step.

An object of the present invention is to align a work hole position and phase of a lathe which can correct an error in a rotational phase when a work is mounted on a spindle and correct the position to an appropriate position, thereby improving machining accuracy. It is to provide a method.

[0005]

The structure of the present invention will be described with reference to FIG. 1 corresponding to an embodiment. The work hole position phase aligning method of this lathe is a method including the following steps. First, the touch sensor (2) of the tool rest (5) is inserted into the hole (Wa) on the end surface of the work (W) held by the spindle chuck (14).
0) is inserted to the set position (C). The spindle (4) is rotated in the forward and reverse directions until the inner surface of the hole (Wa) contacts the touch sensor (20), and the rotation direction coordinate value of the spindle (4) at the time of contact is detected. From this coordinate detection value, the rotation direction coordinate value of the center position of the hole (Wa) is calculated. The calculated value of the hole center position and the set value (for example, the origin position) are compared to correct the rotational phase of the spindle (4) by the amount of deviation.

[0006]

According to this method, the rotation direction coordinate value of the center position of the hole (Wa) of the work (W) is obtained using the touch sensor (20) of the tool rest (5), and the rotation phase is corrected by the amount of deviation. Therefore, the work hole position can be corrected to an appropriate position, and the machining accuracy is improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a schematic front view of a two-axis lathe with a loader. The lathe body 1 has a headstock 3 at the center of the upper surface of the bed 2.
Two spindles 4 are provided via the turret, and two turret carriages 6 each mounting a turret 5 serving as a tool rest are installed on both sides of the spindle stock 3. The loader 7 is provided with an elevating rod 11 via a front-rear moving table 10 on a traveling table 9 which laterally moves on a rail 8 installed above the lathe body 1, and a loader head 12 is provided at the lower end of the elevating rod 11. It is a thing.
The loader head 12 has two loader chucks 13 on the facing surface and the lower surface of the main shaft 4, and the positions of both chucks 13 can be interchangeably driven.

As shown in FIG. 3, the spindle 4 has a spindle chuck 14 for gripping the work W at the shaft end, and a spindle motor 15
Thus, high speed rotation and forward and reverse indexing rotation are performed. The spindle chuck 14 has a scroll-type chuck claw 14a. The turret carriage 6 has a slide base 16 movably installed laterally (X axis) on a rail 29 of a bed 2 and an index housing 17 movably installed back and forth.
8 and the Y-axis servomotor 19 feeds through a feed screw.

The turret 5 is a drum having a polygonal front surface, and various tools (not shown) such as a bite and a rotary tool are attached to the tool station S consisting of respective peripheral surface parts, and an index housing is provided. The indexing mechanism in 17 causes indexing rotation. Touch sensor 2 for various in-machine measurement at one place of tool station S of turret 5.
0 is provided. The touch sensor 20 includes a touch trigger probe that generates a trigger signal when an object contacts the spherical detector 20a at the tip.

FIG. 1 shows a control system. NC device 21
The machining program written in C code is read by the arithmetic and control unit and servo motors 18 and 19 for each axis and spindle motor 1
5 is provided with a drive command, and is provided with a programmable controller (not shown) that performs various sequence control of the lathe according to the sequence code of the machining program or the separately stored sequence program.

A sensor moving means 22, a spindle angle control means 23, a coordinate value reading means 24, a center position calculating means 25, and a correcting means 2 are provided in the NC device 21 having such a basic structure.
6 and 6 are provided.

The sensor moving means 22 indexes the touch sensor 20 by the rotation of the turret 5 in response to the phase adjustment command a, and drives the axis servomotors 18 and 19 to penetrate the touch sensor 20 through the work W. It is composed of a program to be inserted into the hole Wa. To move the touch sensor 20, after fast-forwarding from the start position P to the elapsed position A,
The skip cutting feed is set until the measurement position C is reached through the elapsed position B. The coordinate values of the respective positions P and A to C are designated on the program of the sensor moving means 22 in advance. The sensor moving means 22 is provided with a retry means 28 for re-inserting the touch sensor 20 after the rotation of the main shaft 4 when the touch sensor 20 cannot be inserted into the through hole Wa.

The spindle angle control means 23 comprises a spindle motor 15
Is a means for driving the main shaft 4 to skip forward and reverse by the set angle θ. The functions of the other means 24 to 26 will be described later together with the description of the operation. An angle detector 27 is provided on the spindle 4.

Next, a method of aligning the phase of the hole with the above configuration will be described with reference to FIGS. Through hole Wa
When the machined work W of (1) is gripped by the spindle chuck 14, a phase matching command a is generated by an appropriate means to start the phase matching.

The touch sensor 20 fast-forwards from the start position P to the elapsed position A, and then moves to the measurement position C in the through hole Wa by skip cutting feed (step S1 in FIG. 5). After that, the spindle angle control means 23 rotates the work W by skip rotation of the spindle 4, and the coordinate value reading means determines the rotation direction coordinate value (mechanical coordinate value) when the inner surface of the through hole Wa contacts the touch sensor 20. It is read and stored in 24 (S2). The work W is sequentially rotated in the forward and reverse directions, and the respective coordinate values are stored. The spindle 4 stops its rotation when there is a detection signal from the touch sensor 20 and moves to the next operation. However, even if the spindle 4 is rotated by an angle corresponding to the hole diameter registered in advance, no detection signal is obtained, the next operation is performed. Move to.

After detecting the rotational direction coordinate values of the two inner surfaces of the through hole Wa in this manner, the through hole W is detected from these detected values.
The true center position of a is calculated by the center position calculating means 25 (S3). The calculation result is compared with the set coordinate value (for example, the origin position) by the correction means 26, and the spindle 4 is rotated by the amount of deviation to correct the rotation phase (S4). The rotation of the spindle 4 for correction is performed after the touch sensor 20 is returned to the start position P.

After the position of the through hole Wa is corrected in this way, the processing of the through hole Wa or the processing based on the through hole Wa is started. Therefore, it is possible to perform the machining with high accuracy, and it is possible to prevent the machining from being impossible due to a poor mounting of the work W on the spindle 4.

In the process of inserting the sensor (S1),
When the touch sensor 20 cannot be inserted into the through hole Wa due to the large displacement of the through hole Wa, the touch sensor 20
When comes to the position B, the workpiece W is contacted and a contact signal is obtained. In response to this signal, the retry means 28 in the sensor moving means 22 rotates the spindle 4 in the predetermined direction by the set angle θ, and the inserting operation of the touch sensor 20 is repeated. The number of times of this repetition is stored in the retry means 28, and when the correction means 26 corrects it later, a value which is a multiple of the rotation angle θ is added.

The respective positions A to C in FIG. 1 are specifically the following positions. The A position is a position shifted from the B position in the + Z direction by a predetermined approach movement amount and a radius of the detector 20a of the touch sensor 20. The B position is the detector 20a.
Is the position located at the end surface of the workpiece W in the Z-axis direction. The C position is a position shifted from the B position in the −Z axis direction by a predetermined approach movement amount.

The NC device 21 is provided with an alarm means (not shown) so that the touch sensor 20 can move the work W at a position other than the regular program position in each of the steps (S1, S2).
When the touch sensor 20 makes contact with the touch sensor 20, or when the touch sensor 20 makes contact only in one direction of the through hole Wa when the spindle 2 rotates, an alarm is generated.

Further, although the above embodiment has been described for the case of being applied to a two-axis turret lathe, the present invention can be applied to various lathes having a rotary tool.

[0022]

According to the work hole position phasing method of the present invention, the touch sensor of the tool rest is inserted to the set position in the hole of the end face of the work held by the spindle chuck, and the inner surface of the hole contacts the touch sensor. Until the rotation direction coordinate value of the spindle at the time of contact is detected, the rotation direction coordinate value of the center position of the hole is calculated from the detected coordinate value, and compared with the set value, the shift amount of the spindle is calculated. Since the rotation phase is corrected, the work hole position can be corrected to an appropriate position, and the processing accuracy is improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a conceptual configuration of a lathe to which an embodiment of the present invention is applied and a control device therefor.

FIG. 2 is a schematic front view of the lathe.

FIG. 3 is a partially enlarged plan view of the lathe.

FIG. 4 is a front view showing a relationship between a spindle of the lathe and a touch sensor.

FIG. 5 is a flow chart showing a process of a work hole position / phase aligning method of the embodiment.

[Explanation of symbols]

4 ... Spindle, 5 ... Turret (turret), 7 ... Loader, 14
... spindle chuck, 15 ... spindle motor, 18 ... X-axis servo motor, 19 ... Y-axis servo motor, 20 ... touch sensor, 20a ... detector, 21 ... NC device, 22 ... sensor moving means, 23 ... spindle angle control means. , 24 ... Coordinate value reading means, 25 ... Center position calculation means, 26 ... Correction means, 27 ...
Angle detector, W ... Work, Wa ... Through hole

Claims (1)

[Claims] 1. A process of inserting a touch sensor of a tool post into a hole on an end surface of a work gripped by a spindle chuck to a set position, and rotating the spindle forward and backward until an inner surface of the hole comes into contact with the touch sensor. Then, the process of detecting the rotation direction coordinate value of the spindle at the time of contact, the process of calculating the rotation direction coordinate value of the hole center position from this coordinate detection value, and the calculated value and set value of this hole center position A method for aligning a work hole position phase of a lathe including a step of compensating the rotational phase of the spindle by a deviation amount in comparison.