JPH0639036B2 - Machining position correction device for NC machine tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention supports an end face or end chamfering process of a work by supporting the inner diameter tapered portions of both ends of the work by an NC machine tool by a center of a headstock and a tailstock. The present invention relates to a machining position correction device for an NC turning machine tool when performing.

[Conventional technology]

In the conventional NC lathe, for example, when the inner diameter taper part of the joint for oil well pipes is supported at both centers to process the end face or end chamfer of the work, there is an error in the total length of the work and the taper part of the work. After performing the process, the work is measured one by one to obtain a correction amount, and the corrected measurement data is manually input to the NC device for processing.

[Problems to be solved by the invention]

The above-described conventional correction means have a problem that the operator manually inputs the measurement data one by one, so that the correction takes too much time and cannot be automated.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem in view of the above circumstances, and to provide a machining position correcting device for an NC machine tool in which a measuring device automatically takes in a correction value to enable automation. It is in.

[Means and Actions for Solving Problems]

The present invention is a machining position correcting device for performing work end face or end chamfering machining of an NC machine tool, and its concrete means is attached to an NC machine tool having an NC machining program data memory and controlled. A machining position correction device that corrects the machining position of the workpiece to be turned in the axial direction of the workpiece, and inputs the machining reference data of two opposite end face positions in the axial direction of the reference workpiece from the machining program origin. Means, a program coordinate value memory for storing the machining reference data inputted by the input means, and a workpiece provided on the outside of the NC machine tool for measuring the dimensions of the reference workpiece and the workpiece. And a base of the measuring device having an abutting portion formed in the axial direction, and a slider provided on the base so as to be movable in the axial direction. A reference cage provided on the slider so as to move toward the abutting portion and abutting on the reference work positioned on the abutting portion or a reference portion of the work, and provided on the slider, the reference cage Detection for detecting an error in each end face between the measurement position of each end face part when the reference gauge contacts the reference part and the measurement position of each end face part when the reference gauge contacts the reference part of the workpiece Means, arithmetic means for performing an arithmetic operation for correcting the machining position from the machining reference data stored in the program coordinate value memory and an error of each measurement position detected by the detecting means, and the arithmetic means And a machining position memory for storing the machining device.

By adopting the device of the present invention, the error between each end face position of the work to be machined and each end face position of the reference work which is preliminarily input is measured by the measuring device provided outside the NC machine tool. However, by automatically incorporating the measured value, the correction of the processing position is automatically performed, and the end surface processing or the end chamfering processing of the work can be easily and easily performed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

(1) First, the basic principle of the present invention will be described.

FIG. 2 is an explanatory view showing a state in which the inner diameter taper portion of the work is supported by both centers when the inner diameter having the taper portion is machined in the previous process and the end face machining or chamfering work of the work is carried out in the present process.

In FIG. 2, one center C ₁ is gripped by a chuck H attached to the front of the main shaft of an NC lathe via a claw D. A work W having an inner diameter tapered portion at _one center C ₁
And the other center C ₂ attached to the tip portion of the tailstock E from the other side to press and hold.

Now, the position of the claw end surface at the axis C _L of the center C ₁ is set as the machining program origin _P , and the machining program origin _P
If the distance from to the machine origin _M of the machine coordinate system is Z _M , Z _M becomes the work coordinate system setting data. The position on the machining program is set from this machining program origin _P.

If the work indicated by the chain double-dashed line is the reference work W ₀ , the reference work length is L _0, and the distances from the machining program origin _P to the reference work end face are set in advance as L ₁₀ and L ₂₀ , L ₀ = L ₁₀
-L is _20.

If there is an error with respect to the length and inner diameter tapered portion reference work W ₀ of the workpiece W to be machined and is clamped as indicated by the solid line, the error △ l ₁ with respect to the distance L _10, L ₂₀ of the reference workpiece W _0, It is assumed that Δl ₂ is obtained in advance. If the distances from the machining program origin _P to the respective end faces of the solid line work W are L ₁ and L ₂ , then L ₁₀ = L ₁ + Δl ₁ and L ₂₀ = L ₂ + Δl ₂ are obtained.

Thus, the values of L ₁ and L ₂ of the work W to be machined are obtained from the above equations with L ₁ = L ₁₀ −Δl ₁ and L ₂ = L ₂₀ −Δl ₂ .

Moreover, since the total length is L = L ₁ −L ₂ , L = (L ₁₀ −Δl ₁ ) − (L ₂₀ −Δl ₂ ) = (L ₁₀ −L ₂₀ ) −Δl ₁ + Δl ₂ Become.

Further, since L ₀ = L ₁₀ −L ₂₀ , L = L ₀ −Δl ₁ + Δl ₂ holds.

Thus, L ₁ , L ₂ and L are the machining program origin _P
Error from the machining program origin _P to the end surface of the work W relative to the distance from the end surface of the reference work W ₀ to Δ
As long as l ₁ and Δl ₂ are determined in advance, the correction at the actual machining position is automatically processed.

(2) machining program error △ l ₁ of the distance from the origin _P to the end surface of the workpiece W from the machining program origin _P relative to the distance to the end surface of the reference workpiece W _0, described measurement of △ l _2.

FIG. 3 is a model explanatory view of the out-of-machine measuring device for measuring the errors Δl ₁ and Δl ₂ .

In FIG. 3, a fixed base 100 of the out-of-machine measuring device is placed on the floor. A guide rail 101 extends to the left and right on the fixed base 100, and a slider 103 is attached so as to be movable along the guide rail 101.

On the slider 103, a taper gauge 116 having a taper portion having the same shape as the center of an actual NC machine tool is attached so as to face inward. The block gauge 105 is attached to the fixed base 100.
Is set to the length of the reference work W ₀ .

The measuring element 10 is attached to the tip of the hole formed in the slider 103.
The support members to which 6a and 106b are attached are fitted, and displacement-to-electric converters (hereinafter referred to as indicators) 108a and 108b are attached to the respective support members.

With this out-of-machine measuring device, the two-dot chain line reference work W ₀ is applied to the abutting surface 100 a of the fixed base 100, and the slider 103
Is moved to press the taper gauge 116 against the taper hole of the reference work W ₀ . When the taper gauge 116 is pressed against the taper hole of the reference work W _0, the gauge heads 106a and 106b come into contact with the block gauge 105 surface and the reference work end surface, respectively. In this state, the indicators 108a and 108b are set to 0.

Similarly to the case where the reference work W ₀ is removed and the reference work W ₀ is set, the work W to be processed (solid line) is applied to the abutting surface 100 a of the fixed base 100, the slider 103 is moved, and the taper gauge 116 is processed. It is pressed against the tapered hole of the work W to be processed.

Measuring elements 106a and 106b are block gauges 1 respectively.
The end surface of No. 05 and the end surface of the work to be machined are brought into contact. The displacement of the indicators 108a and 108b in this state is output. The value measured by the indicator 108a is Δl ₁ , and the value measured by the indicator 108b is Δl _1.
It is l ₂ .

The measured values Δl ₁ and Δl ₂ obtained by the external measuring device are NC.
By inputting the data to the control device, the machining position is automatically corrected corresponding to the work data and a predetermined turning process is performed.

(3) A specific structure of the out-of-machine measuring device used in the present invention will be described.

FIG. 4 is a partial plan sectional view of the out-of-machine measuring device, and FIG.
FIG. 6 is a view on arrow I, FIG. 6 is a view on arrow II in FIG. 4, and FIG. 7 is a view on arrow III in FIG.

In FIGS. 4 to 7, a guide rail 101 is installed on a fixed base 100, and a slider 103 is moved in the Z axis direction via a guide surface bearing 102. A substantially central portion of the fixing table 100 has a surface 100a inclined in a V shape so that a reference work or a work can be stably placed when viewed from the side (FIG. 7). A stopper plate 104 for abutting and positioning a work is provided on the left side (FIG. 4) of the fixed base 100.
Is installed. A block gauge 105 is attached to the rear end of the stopper plate 104 so as to extend rightward (FIG. 4). The length of the block gauge 105 is set to the length of the reference work.

Support members 107a and 107b for supporting the measuring elements 106a and 106b are attached to the right side of the slider 103 (FIG. 4). The rear ends of the gauge heads 106a and 106b are built in the support members 107a and 107b, respectively, and the front ends thereof come into contact with the front end of the block gauge 105 and the end surface of the mounted work.

An indicator 1 is provided on the right side of the support members 107a and 107b.
Contacts 109a, 109 connected to 08a, 108b
b is built in. Measured value earlier in the indicator 108a △ _{l 1} is the measured value in the indicator 108b △ _{l 2} is read. A spring 110 is provided inside the support members 107a and 107b, and the gauge heads 106a and 106b are biased to the left (FIG. 4). Measuring element 106a, 10
The tip end of 6b abuts on the tip end of the block gauge 105 and the end surface of the work piece, respectively, and
a and 106b are rear end portions of indicators 108a and 108a.
b contacting the tips of the contacts 109a, 109b of b, and measuring values Δl ₁ , Δl ₂ from the indicators 108a, 108b.
Is output.

Support members 107a and 107 fixed to the slider 103
A guide rail 111 is mounted between the first plate 113 and the guide rail 111 via a guide bearing 112.
Is installed. A guide rail 114b is provided on the first plate 113, and a second plate 115 is attached via a guide bearing 114a. Further, a taper gauge 116 is screwed to the second plate 115 with a bolt 117. The taper gauge 116 can be replaced according to the type of work.

Thus, the reference work or the work is placed on the inclined surface 100a of the fixed base 100, and the end surface of the reference work or the work is brought into contact with the stopper plate 104.

The handle 1 of the first plate 113 so that the taper gauge 116 can be fitted to the end surface of the reference work or the work.
An operator operates the 13a in the X-, Y-, and Z-axis directions to position it.

The gauge head 106a is the tip portion 105 of the block gauge 105.
The measuring element 106b is brought into contact with the reference work or the processed work at a, and the measured values of the indicators 108a and 108b are output.

In the case of the reference work, the indicators 108a, 1a
The measured value of 08b is set to 0, and Δl ₁ and Δl ₂ are output as the measured values of the indicators 108a and 108b in the case of the workpiece. By inputting the output values of Δl ₁ and Δl ₂ to the NC control device, the machining position correcting device of the present invention operates to correct the machining position, and then predetermined end face machining or chamfering machining is performed.

(4) The configuration of the present invention will be specifically described based on the above-mentioned reference principle.

FIG. 1 is a control block diagram showing the configuration of the present invention.

In FIG. 1, a CPU (central processing unit) 1 has a length L ₁₀ from a machining program origin _P to an end surface of a reference work,
L ₂₀ or the like is input from the keyboard with screen 2 via the input / output device 2a.

The measurement value Δl ₁ , from the machining program origin _P to the end face of the workpiece in the workpiece with the above-mentioned external measuring device,
The Δl ₂ is measured by the indicators 108a and 108b, and the error values Δl ₁ and Δl ₂ are automatically input through the interface 3, and the measured value Δl ₂ and the measured value Δ are stored in the memory 11.
l ₂ is once stored. Measured value to the measurement value △ _{l 1} · memory 12 △ _{l 1} is temporarily stored. NC processing program data is transferred from the paper tape 4 to the NC via the input / output device 4a.
It is stored in the machining program data memory 5.

The position sending means 6 is composed of an interpolator, a position control circuit 6a, an amplifier 6b and a servomotor 6c, and the position sending means 6 is controlled by position data. The position data, that is, the machine coordinate value Zn (M) is always taken in the machine coordinate value / memory 7.

The AND gate 8 is opened by the work coordinate system setting signal from the keyboard 2 with screen, and the machine coordinate value Zn (M) stored in the machine coordinate value / memory 7 passes through the AND gate 8 to set the work coordinate system. It is stored in the setting data memory 9.

In advance, the program coordinate value L ₂₀ , which is the length of the reference work,
L ₁₀ is input from the keyboard 2 with a screen, and each value L
₂₀ and L ₁₀ are stored in the program coordinate value / memory 10 and the program coordinate value / memory 13.

The program coordinate value L ₂₀ stored in the program coordinate value / memory 10 is supplied to the first calculating means 16 and the third calculating means 18,
The program coordinate value L ₁₀ stored in the program coordinate value / memory 13 is fetched by the second calculating means 17 and the third calculating means 18.

Data set signal by the input switch of the outside measuring device to open the AND gate 14 and AND gate 15, the measurement value △ l ₂ · memory 11 to the stored measured value △ l ₂ passes through the AND gate 14 The first computing means 16 and the third
The calculation means 18 is loaded. Measured value △ l _1-memory 12 to the stored measured value △ l ₁ passes through the AND gate 15 takes a second arithmetic means 17 to the third arithmetic means 18.

Thus, in the first computing means 16, the machining program origin _P
One of the length _{L 2} of the workpiece end face of the _{L 2 = L 20 - △ l} 2, the length of the other _{L 1} of the workpiece end face from the second arithmetic means 17 in the machining program origin _P is L ₁
= L ₁₀ −Δl ₁ and the third calculation means 18 calculates the total length L of the work by the calculation processing of L = (L ₂₀ −L ₁₀ ) −Δl ₁ + Δl ₂ .

The lengths L ₁ and L ₂ of the respective work end faces obtained by the first calculating means 16 and the second calculating means 17 are the processing position / memory 19 respectively.
It is stored in and is rewritten with the previous value.

The total length L of the work obtained by the third calculating means is stored in the work length actual measurement value / memory 20 as management data in automation.

The machining positions L ₁ and L ₂ stored in the memory 19 are transferred to the NC machining program data memory 5, and the NC machining program operates to perform predetermined end face machining or chamfering machining.

(5) The operation of the present invention will be described.

First, the reference work W ₀ is set in the out-of-machine measuring device having the taper gauge 116 and the block gauge 105, and the respective measuring elements 106a and 106b are brought into contact with the reference arc end surface and the block gauge surface. Each measuring element 106a, 1
The indicators 108a and 108b are set to 0 with the 06b abutting. The reference work is removed from the measuring device, the work to be machined is set in order, the respective measuring elements 106a and 106b are brought into contact with the work end surface and the block gauge surface, and the displacement of the indicators 108a and 108b is output to output the reference work W. Measured values Δl ₁ , Δ which are the difference between the end surface position of each work W and the end surface position of ₀
l ₂ is required.

From the measured values Δl ₁ and Δl ₂ and the program coordinate values L ₁₀ and L _{20 of the} reference work, L ₂ = L ₂₀ − in the first calculation means 16.
△ _{l 2,} in the second arithmetic means _{17 L 1 = L 10 - L} = at △ _{l 1,} and third arithmetic means _{(L 20 -L 10) - △} l 1 + △ l 2
The respective values L ₁ and L ₂ are stored in the machining position memory 19 and the value L is stored in the workpiece total length measured value / memory 20, and then L ₁ and L ₂ are stored in the NC machining program data memory 5 Then, the NC automatic operation is started, and a predetermined end surface processing or chamfering processing is performed.

〔effect〕

By adopting the device of the present invention, NC machine tools, especially N
Since the machining position is automatically corrected when the end face or the end part of the workpiece is chamfered by the C turning machine tool, the correction can be performed quickly and accurately. Thus, the time required for the end face or the end chamfering process is greatly shortened as compared with the conventional technique, which leads to an improvement in productivity.

[Brief description of drawings]

FIG. 1 is a control block diagram showing the configuration of the present invention. FIG. 2 is an explanatory diagram of a state in which the workpiece is supported at both centers of the inner diameter taper portion when the end surface processing or the chamfering processing of the work having the inner diameter having the taper portion is performed in the previous step. FIG. 3 is a model explanatory view of the out-of-machine measuring device for measuring the errors Δl ₁ and Δl ₂ . FIG. 4 is a partial plan sectional view of the out-of-machine measuring device, and FIG.
FIG. 6 is a view on arrow I, FIG. 6 is a view on arrow II in FIG. 4, and FIG. 7 is a view on arrow III in FIG. 1 ... CPU, 2 ... keyboard with screen 5 ... NC machining program data / memory 6 ... position sending means, 7 ... machine coordinate value / memory 9 ... work coordinate system setting data / memory 16 ... first arithmetic means, 17 ...... second arithmetic means 18 ...... third arithmetic means, 20 ...... workpiece entire length Found memory H ...... chuck, D ...... pawl C _{1, C} 2 _...... center _{P ......} machining program origin , _M …… Machine origin 104 …… Stopper plate 105 …… Block gauge 106a, 106b …… Measuring element 108a, 108b …… Indicator 116 …… Taper gauge

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Ogura 1 Abiko, Abiko City, Chiba Prefecture Hitachi Seiki Co., Ltd. (56) References JP-A-50-153190 (JP, A) JP-A-57-21264 ( JP, A)

Claims (1)

[Claims] 1. A machining position correcting device which is attached to an NC machine tool controlled by having an NC machining program data memory and corrects the machining position of a workpiece to be turned in the direction of the work axis. Input means for inputting machining reference data of two opposite end face positions in the axial direction of the reference workpiece from the program origin, program coordinate value memory for storing the machining reference data input by the input means, and the NC machine tool Of the measuring device, which is provided outside of the measuring device, which mounts each of the workpieces to measure the dimensions of the reference workpiece and the workpiece, and which forms the abutting portion in the axial direction, and the base. The slider provided so as to be movable in the axial direction, and the reference provided on the slider so as to move toward the abutting portion and positioned at the abutting portion. A reference cage abuts the reference portion of the over-click or work, provided on the slider, and the measurement position of each end face when said reference gauge to a reference portion of the reference workpiece is in contact,
Detection means for detecting an error at each end face with respect to a measurement position of each end face portion when the reference gauge comes into contact with the reference part of the work; and the processing reference data and the detection stored in the program coordinate value memory. Compensated machining position, which comprises an arithmetic means for compensating the machining position from the error of each measurement position detected by the means, and a machining position memory for storing the machining position corrected by this arithmetic means. A machining position correcting device for an NC machine tool, wherein data is transferred to the NC machining program data memory to automatically operate the NC machine tool.