JPS6130356A - Working in n.c. lathe - Google Patents

Abstract

PURPOSE:To permit the continuous working for a workpiece continuously in unmanned state by providing a standard-position correcting program memory and installing a Z-axis coordinate measuring means for the standard plane of a work separately from a tool. CONSTITUTION:A standard-position correcting program memory 5 into which a standard-position correcting program AMP is stored is installed, and the Z-axis coordinat measuring means for the standard plane of a work such as a touch sensor 12, etc., separately from a tool 17 is installed. After a work 16 is caught, the Z-axis cooridnate value of the standard planes such as the edge surface 16a, working surface 16c, side surface 16d, etc. of the work 16 is measured by the above-described Z-axis coordinate measuring means on the basis of the standard- position correcting program AMP, and the coordinate corrected value AX for the supposed standard position USP is obtained from the Z-axis coordinate value of the measured standard plane. Then, the working standard position RSO of the work 16 is set, and the working on the basis of the working program PRO is carried-out. Therefore, the working for the work 16 can be carried-out continuously in unmanned state.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is a numerically controlled lathe that is capable of changing a machining reference position according to variations in the position of a chucked workpiece in the Z-axis direction. This article relates to machining methods in numerically controlled lathes.

(b), conventional technology Conventionally, when processing a workpiece by mounting it on a lathe.

The end face of a workpiece in the Z-axis direction is often employed as a machining reference position on a machining program (hereinafter, this "machining reference position on a machining program" is referred to as a "virtual reference position"). In such a case, since the machining based on the machining program is performed based on the virtual reference position, the Z coordinate of the workpiece end face does not match one virtual reference position and the workpiece is chucked.

(Actually, there are few cases where the end face of the workpiece is chucked in alignment with the virtual reference position.)
The tool tip is once applied to the end surface of the workpiece, its Z coordinate position is measured, and the error between that value and a preset virtual reference position is corrected for machining.

(C) 0 Problems to be solved by the invention However, with this method, each time a workpiece is machined, the operator needs to touch the cutting edge to the workpiece to correct the virtual reference position, which requires extremely troublesome work. Not only that, but it also went against the recent trend toward unmanned processing operations. In addition, when performing correction by applying the cutting edge to the workpiece, it is necessary to feed the tool to the end face of the workpiece by cutting feed in order to prevent the cutting edge from being damaged, which has the disadvantage of requiring 9 hours of time. Ta.

Additionally, in order to eliminate these inconveniences, there was a method in which the end face of the workpiece was preliminarily machined until it coincided with the virtual reference position, but this method eliminates the need to measure the radius each time. However, the pre-processing to align the end face of the workpiece with the virtual reference position not only takes a lot of time, but also requires a large amount of cutting allowance, resulting in wasted material.

In order to solve the above-mentioned drawbacks, the present invention eliminates the need to manually correct the virtual reference position by bringing a tool into contact with the work each time the work is chucked, and therefore continuously Workpieces can be machined unattended, and there is no need to worry about tool damage when measuring coordinates. Not only can coordinates be measured quickly, but pre-machining can be performed before executing the machining program. The purpose of this invention is to provide a machining method in a numerically controlled lathe that does not require any processing.

(d) Means for solving the 6 problems, that is, the present invention provides a reference position correction program memory storing a reference position correction program, and also provides a means for measuring the Z coordinate of the reference surface of the workpiece separately from the tool. , After chucking the workpiece, process the workpiece based on the machining program.

Before performing the measurement, the Z coordinate value of the reference surface of the workpiece is measured by the Z coordinate measuring means based on the reference position correction program read from the reference position correction program memory, and the Z coordinate value of the measured reference surface is determined. A coordinate correction value for the virtual reference position is determined from the coordinate correction value, a machining reference position is set for the workpiece based on the coordinate correction value, and machining is performed based on the machining program based on the machining reference position. .

(e) 0 effect With the above-described configuration, the Z coordinate measuring means measures the Z coordinate of the reference surface of the workpiece based on the reference position correction program, and based on the result, the machining reference position at which the machining program should be executed is determined. is determined, and the machining is executed according to the machining program based on the determined machining reference position.

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a control block diagram showing an example of a numerically controlled lathe to which an embodiment of a machining method according to the present invention is applied, and FIGS. 2 to 4 are schematic diagrams showing how to set a machining reference position according to the present invention. It is.

As shown in FIG. 1, the numerically controlled lathe 1 has a main control section 2, and the main control section 2 is connected via a bus line 3 to a reference position correction program memory 5, a turret drive control section 6, A touch sensor drive control section 7, a machining reference position setting section 9, a machining program memory 0, etc. are connected. The turret drive control section 6 has a turret 11, and the touch sensor drive control section 7 has a touch sensor 2, which are controlled by respective control sections 6.7 in the Z-axis and X-axis directions, that is, in the direction of arrows A1B and C and D. The touch sensor 12 is connected to the processing reference position setting section 9 .

A coordinate calculation unit 13 is connected. Further, a machining reference position coordinate value memory 57 is connected to the machining reference position setting section 9. Note that the number 16 represents a chucked work.

Since the numerically controlled lathe 1 has the above configuration, the machining of the workpiece 16 by the numerically controlled lathe 1 is "1, machining i, machining 5".
A)%! J□. 34. Oh my goodness. Based on Durham PRO, the main control section 2 drives the tool post 11 to move in the directions of arrows A, B, C, and D via the tool post drive control section 6 together with the tool 17 mounted on the tool post 11. I'm going to go. At this time, the machining of the workpiece 16 by the tool 17 is performed based on the virtual reference position USP that was used as the reference when the machining program PRO was created, and therefore, if no correction is made, the tool 17 Positioning is performed based on the virtual reference position USP. Therefore, before the workpiece 16 is mounted on the chuck and machining is performed based on the machining program PRO, the main control unit 2 reads out the reference position correction program AMP from the reference position correction program memory 5 and performs the correction operation for the reference position. Execute.

That is, the main control section 2 drives the touch sensor drive control section 7 based on the instructions of the reference position correction program AMP.
The touch sensor 12 is brought into contact with the end surface 16a of the cut work 16 where the actual machining reference position R3P is set.

When the touch sensor 12 comes into contact with the workpiece end surface 16a, a signal S1 is output from the touch sensor 12 to the coordinate position calculation section 13, and the coordinate position calculation section 13 calculates the Z coordinate value of the touch sensor 12 at that time, and hence of the workpiece end surface 16a. The calculated Z coordinate value Z9 is output to the processing reference position setting section 9. The machining reference position setting unit 9 compares the Z coordinate value Zx of the virtual reference position USP in the machining program PRO with the coordinate value Z of the end face 16a, and determines the coordinate correction value AX using equation (1).

AX='Z6-Z,
(1) Once the coordinate correction value AX has been determined, the processing reference position setting unit 9 virtually sets the processing reference position R3P for the currently chucked workpiece 16 based on the coordinate correction value AX. Coordinate the reference position USP.

The coordinate value is set to be shifted in the Z-axis direction by an amount corresponding to the correction value AX, and the coordinate value is stored in the machining reference position coordinate value memory 15.

In this way, when the machining reference position R3P for the workpiece 16 to be machined is set, the machining reference position setting section 9 sets the machining reference position RSP.

The setting completion signal S2 is output to the main control section 2, and
Immediately upon receiving this, the machining based on the machining program PRO is performed based on the machining reference position R3P stored in the machining reference position coordinate value memory 15, not based on the virtual reference position USP. Then, the workpiece 16 has a machining reference position R3P set on its end face, so when machining with the four-gr nib PRO, the tool 17 is set at the virtual reference position USP.
Do not perform unnecessary cutting operations until the end surface 16a is removed immediately.
It starts from.

The machining based on the machining program PRO for the workpiece 16 is completed, the workpiece 16 is removed, and a new workpiece 16 is installed.
When the work 1 is chucked, the main control unit 2
As in case 6, before performing machining based on the machining program PRO, an operation is performed to correct the virtual reference position USP to the machining reference position R3P using the reference position correction program AMP, and then machining based on the machining program PRO is started. That is, the setting operation of the machining reference position R8P by the reference position correction program AMP is performed for each workpiece 16.

In addition, although the above-mentioned embodiment described the case where the touch sensor 12 was used as the Z coordinate measuring means of the workpiece 16,
Any means for measuring the Z coordinate may be used as long as it can measure the coordinates of a reference surface such as the end surface 16a of the workpiece 16.
Of course, non-contact means using a laser or the like may also be used.

Further, FIG. 2 shows a case where the reference plane such as the workpiece end surface 16a is located to the left of the virtual reference position USP in the figure, and the coordinate correction value AX is negative. Furthermore, in Figure 3, workpiece 1
An example is shown in which the reference plane of No. 6 is not set at the end surface 16a of the workpiece 16, but is set at another side surface 16d. In this way, the reference surface of the workpiece 16 measured by the Z coordinate measuring means does not necessarily have to coincide with the end surface 16a where the machining reference position R3P is set, but may be in the Z-axis direction with respect to the machining reference position R8P. Even if they are separated by a certain distance 1iL, if the distance is a known value, the coordinate correction value AX can be determined by taking the distance into consideration, and there will be no problem. Also, as shown in Figure 4,
The machining surface 16c machined in the first step is used as the reference surface of the workpiece 16, and when setting the machining reference position R3P for the second step after reversing the workpiece, using the machining surface 16c as a reference. When the present invention is applied, the second process can be started quickly after the workpiece 16 is reversed, so it is extremely effective. For example, a reference position correction program memory 5 storing a reference position correction program AMP is provided, and a means for measuring the Z coordinate of the reference surface of the workpiece, such as a touch sensor 12, is provided separately from the tool 17, and after chucking the workpiece 16, , machining program PRO
Before performing machining on the workpiece 16 based on the reference position correction program AMP, the Z coordinate values of the reference surfaces such as the end surface 16a, the processed surface 16c1 and the side surface 16d of the workpiece 16 are measured by the Z coordinate measuring means based on the reference position correction program AMP. Then, a coordinate correction value AX for the virtual reference position Usp is determined from the Z coordinate value of the measured reference plane, and a machining reference position R3P for the workpiece 16 is set based on the coordinate correction value AX, and the machining reference position R8P is set. The configuration is such that machining is performed based on the machining program PRO based on the processing program PRO.This eliminates the need for the operator to manually correct the virtual reference position by bringing the tool 17 into contact with the workpiece 16 each time the workpiece 16 is chucked. There is no need to carry out the work, and the workpiece 16 can be processed continuously in an unmanned state.

In addition, since the Z-axis coordinate measuring means is provided separately from the tool 17, there is no need to worry about damage to the tool 17 when measuring coordinates, and the coordinate measurement can be performed quickly. This can contribute to reducing the overall time required.

Furthermore, since there is no need to perform pre-machining to align the end face of the workpiece 16 with the virtual reference position usp before machining based on the machining program PRO, unnecessary cutting operations are prevented from occurring and machining time is significantly reduced. Not only is the cutting time reduced, but the machining allowance for the workpiece is also reduced, and expensive materials are not wasted.

[Brief explanation of the drawing]

FIG. 1 is a control block diagram showing an example of a numerically controlled lathe to which an embodiment of the processing method according to the present invention is applied, and FIGS. 2 to 4 are schematic diagrams showing how to set the processing reference position according to the present invention. be. 1... Numerical control lathe 5... Reference position correction program memory 10...
... Machining program memory 11 ... Turret 12 ... Z coordinate measuring means (touch sensor) 16
Workpiece 16a... Reference surface (end surface) 16c... Reference surface (processed surface) 16d... Reference surface (side surface) 17...・Tools. Zs...Coordinate value PRO...Machining program AMP...Reference position correction program R3P...
...Processing reference position usp...Virtual reference position Applicant Yamazaki Iron Works Co., Ltd. Agent Patent attorney Phase 1) Shinji ZS ZX Work ZS ZX Figure 4

Claims (1)

[Scope of Claims] It has a machining program memory storing a machining program based on a virtual reference position and a tool rest on which a tool is attached, and drives the tool rest based on the machining program read from the machining program memory. In a numerically controlled lathe that performs predetermined machining on a chucked workpiece, a reference position correction program memory storing a reference position correction program is provided, and the Z coordinate of the reference plane of the workpiece is stored separately from the tool. A measuring means is provided, and after chucking the workpiece and before machining the workpiece based on the machining program, the reference surface of the workpiece is determined based on the reference position correction program read from the reference position correction program memory. Measure the Z coordinate value of the reference surface using a Z coordinate measuring means, obtain a coordinate correction value for the virtual reference position from the measured Z coordinate value of the reference surface, and set a processing reference position for the workpiece based on the coordinate correction value. death,
A machining method in a numerically controlled lathe configured to perform machining based on a machining program based on the machining reference position.